The pre-season is practice, and practice games like the one coming up against this Chiefs this weekend serve two primary roles: 1) Give starters and their depth the opportunity get comfortable with each other and with new concepts the coaching staff is rolling out; 2) Winnowing down the back end of the roster by giving those player the opportunity to show their skills in live action.
This piece is focused entirely on the latter.
By my count, there are at least 35 players who are currently on the roster who are ironclad locks, short of some sort of season-ending injury or suspension.