I think you're missing the point. We're looking at Brian Hoyer after he's already played the most influential games to his development, the first 16. We haven't seen Mallett play 6 games yet. Who knows what he'll look like after 10 starts with an OC designing a game plan around what he does?
Andrew Luck's first three games, he was 51%, 64%, & 47%. He threw for 6.9, 7.2, & 6.8 ypa. 52, 107, 75 passer rating... Are you going to start Bryan Hoyer over him because his 16 game numbers are better than Luck's first three?
I know it's not apples to apples, Luck came straight out of college & his OC had the whole offense practicing around what Luck does well for 5 months. But it should be close enough for you to understand the principal.
Mallett may not be as polished as Brian Hoyer. But hopefully, because that's all we've got now, hopefully he'll be better after 10 games.
If Bryan Hoyer's career numbers, or his two game numbers after he's already started 16 games are not where you'd like your place holders numbers to be, then we need to sit Hoyer & start Mallett.