Evan was good on special teams, could get open, and played FB/TE so that is why he ended up there. I assume McDaniel and Harbaugh love the TE position since they signed another TE to their practice squad.
Sawvel probably in a tough spot with Evan year 1. You saw flashes and Bohl labeled him as the next great thing so if Sawvel would have been like nah he is a TE in year 1 than the fanbase would have hated that.
They have good talent on the team it is just their inability to move on from a player who is struggling now 5 for 5 could change some of that as well