He reminds me a bit of a young Hines Ward. He's kind of unassuming to watch him play, but he just gets it done every play rather than taking plays off when he's doubled or having random confusion about which route to run. He just seems to find a way to get open and has good hands, particularly in traffic.
It is hard to tell how much of this is the Buffalo offense (they don't use a TE, per se) and how much of it might be a guy who has been around for a couple years now and the switch has flipped on. I'm also not on the Fitzpatty bandwagon yet (Chan has a history making sow's ears look like silk purses), so I'm not getting over-zealous. But yeah, this guy should be owned in nearly every league at this point.