Unpopular view, probably, but Kelce didn’t destroy the Jags. He had 98 yds on 14 catches - he’s good, and he’s hard to stop, but other teams (cough) have given up >100 yds to Kelce and Smith-Schuster - and won (ahem)
What killed the Jags were 2 turnovers, dropped catches, a couple of horrible penalties, and some crap tackling.
And while the penalties were horrid, the Jags could likely have overcome them.