According to rugby specialists, the young playmaker has shown why he deserves the first-choice spot as England's number ten against New Zealand on Saturday.
The Northampton Saints star delivered without doubt the best defensive display we have seen from an England fly-half in several years.
His courageous approach through regularly completing his tackles against a physical Fijian team was impressive.
His game management proved exceptional - he showed an excellent balance of skill and control, while executing some strong choices during moments didn't proceed as expected during the opening period.
His capacity to calm the team strategically and make important decisions is something he has really mastered.
In my opinion, the young fly-half represents England's primary playmaker and he should begin versus New Zealand this weekend.
I believe head coach Steve Borthwick views it that way too, because Fin has proven he can perform in big international games.
The experienced fly-half began the previous weekend against Australia for leadership reasons, with some aspect of that choice was to provide consistency while acknowledging his form during the visit to South America.
However, the national team's performance versus the Pacific Islanders was a significant step up compared to the display versus the Wallabies.
The Wallabies were defeated in Italy on Saturday, therefore we must not get too carried away with that win, that could have been by a larger margin given how below par Australia performed.
Fiji, by contrast, proved significantly threatening while offering a far tougher test.
The young playmaker is still only twenty-three - projecting forward 24 months, with Ford pushing him but also offering backup, I believe Fin will be in a very strong place as a player.
The Harlequins star also has to be regarded as a possibility when appropriate and versus the right opposition.
He is developing as a player and is starting to find his feet, but he also needs the freedom to show his distinctive qualities.
The All Blacks introduced their impact player, who registered the decisive score defeating Scotland, and that shows the importance of possessing individuals capable of creating genuine influence from the bench.
That kind of presence can be the deciding factor between winning a World Cup from failure.
The All Blacks substitute watches the match unfold from the bench and thinks regarding ways he can make a difference when he comes on.
His decision-making and error rate have improved significantly since his early professional days.
Should we develop Marcus as such type of impactful performer, including him among substitutes might prove beneficial.
However, at the moment I believe Marcus represents the solution at full-back, so that is a role remaining unclaimed.
New Zealand are likely to punt to challenge the English defensive line, so it has remain impenetrable.
It is a position that needs to become a real strength, in defense and in terms offensive transitions danger.
Currently, I don't think Marcus is a full-back at the highest level.
I struggle to see the benefit of playing him in that position.
I want possession under his control as much as possible, but I believe that should be among starters, particularly during the last quarter.
Clearly there exist a lot of parallels comparing Ford with Smith.
Smith possesses the ability to make right decisions under pressure - his natural reactions represent traits you can really taught.
I recall as he received possession at one stage within his own half appearing like it could be on if they spread play.
But in those milliseconds he thought they needed reversing the opposition as we are leading points-wise, therefore he punted it to pin them back and turn pressure.
This represents the type of playmaking securing championships and wins World Cups.
He also has composure under pressure directing the players around him, and the understanding that he mustn't always need to be the first option.
I want to see him given the chance to show that at the highest level next week, similar to George Ford accomplish, particularly during domestic matches repeatedly and week out.
In Argentina, the experienced fly-half also stood up during challenging situations, previously one might suggest occasions existed where he didn't fully done so during extremely tense games.
I believe we have playmaking options who can do the job, though Smith's defence on top of everything else, establishes him as the more complete all-round performer.
This also indicates you don't have to adjust the defensive structure when you have an assertive player occupying the playmaker channel, instead of someone who is somewhat reserved.
You could also present compelling arguments favoring Ford beginning with Smith entering from the bench.
Numerous factors occurring privately, however the coaches decide to go, it will give New Zealand problems.
That has not always been the situation against the All Blacks, when attention concentrated solely on picking the optimal individual.
This time, either playmaker selected will pressure New Zealand significantly.
Fin's ability to pick optimal kicks and execute for a potential territorial gains can take pressure off the national team.
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