That's actually a big difference in size.
Kittle is considerably bigger and stronger.
For each inch of height you need to add 7lbs to be comparable. So Raridon would have to weigh 261 to be comparable to Kittle's size.
He weighs 245. That's a 16lb difference which is huge. Raridon needs his speed and quickness so doubt if he ever puts on 16lbs w/o losing some. But he could add 5lbs a year for 2 years and get to around 255 max by 2028. You probably don't want to get any bigger than that to avoid losing quickness.
And not just weight. It obviously needs to be muscle only and in the right places.
But let's be real: Kittle will go down as one of the alltime great tes and a great blocker.
If Raridon could end up being just slightly above average as a blocker, that's huge.
Because we know hes got receiving skills