Agreed.
They have a couple of free agents of note,(Armstead, Sanders, Breida, Ward) and are tight on cap space. 2021 will be their year of free agent reckoning.
However, the majority of their defense returns and that's their strength. Especially their DL.
If they can land a big-time receiver to compliment Kittle and their running game they could still cause some worry.
But the theoretical "book" on how to defeat them appears to have been written: Cover Kittle, stop the run, put the game in Jimmy's hands.
I suspect they will be tough next season as well, but I can't see another 13-3 year.
We have to beef up both our lines if we want to match up against them.