The all star in camp last year to my eye at least was Higbee. Also remember Quick making some impressive plays, and of course Tavon has impressed in every camp it seems. Goff made some beautiful throws too even if he didn't know wtf he was doing with protections. None of them, of course, did squat really come the season.
But since Higbee was a rookie last year I don't hold it against him, and since he's got a top-level TE coach running the team and offense in McVay, things could not be more aligned for him to have a breakout season. Also the fact that the good TEs in this league seem to start showing it in year two means if he's gonna be a difference maker now's the time.
Thomas was wowing everyone on special teams all through camp and what he did translated all season too. As with Higbee I'm not going to hold his rookie season against him in terms of his production, it is what it is and we knew he would need some time plus this entire offense was a damn joke. Under this staff he has a chance to be something because he is not only talented physically but he's also a hard worker. That stuff can get you far in the NFL.
Lastly Tavon needs to translate camp to the season this year. Otherwise he's gone, be it through cut or trade.