The biggest asset the lad has or seems to have is his ability to adapt to differing roles, from midfielder ball winner with short or long passing ability, to (as demonstrated against Leeds) ' a late runner into the box 'midfielder with 'box to box' playing potential; to centre-back (possibly) with Scotland.
Scott's athleticism and his physical size give him lots of advantages which he is now beginning to exploit, his decision-making skills can at times let him down, but he is showing improvement in all most every aspect of his play.
McTominay's 'utilitarian' abilities might present the longer term problem for his career development. Unfortunately in the past many players who demonstrate proficiency in a number of roles often got denied the chance to shine in a particular role, their usefulness across positions, being too tempting for managers not to exploit. However as we all know football styles and methods are changing, versatility in understanding and playing in different formations, the ability to change roles during a game, are all now much more valued abilities than they used to be.
There is a bright future for Scott if he can remain injury free and hopefully that future will be at OT.