One of the Madden developers talking about player builds. Says they can be changed by a roster update and at any time. Doesn't say they will though
Probably if they get enough noise about it they will.
Shooter McGavin @Equipment_Guru
"yea everything can be tweaked and tuned for bodies via roster update"
"we can tune body sizes on players through the entire year, Derrick Henry is huge but I don't think we had him dialed in at the time of that footage"
"For current players we tweak them to be accurate, I believe there are abilities for you to change to what you desire"