pupscotch, your logic may apply when it comes to voting on the actual awards after nominations come out (though I completely disagree with it since I assure you Tony voters have seen HAMILTON and remember it well--based on your logic, Annaleigh Ashford would have lost last year because her show had closed), but the nominations are decided by the Tony committee who is in charge of seeing every show early on before it closes or the original performers leave the show. Groff's performance is very likely to be remembered come nominations morning; if he doesn't make it onto the list--which I highly doubt--it will not be because the committee did not see him in the performance. I'd actually consider him for the win if it weren't for the fact that Diggs has far more stage time and is equally brilliant.
Jshan05, honestly, if it were up to me I'd give the award to the three HAMILTON men. It's hard for me to say that one was better than the other. But in terms of predictions, I'm sticking with Diggs. Of course surprises always happen, last year many people were predicting Judy Kuhn and Sydney Lucas for Featured Actress and we see how that turned out. So who knows? Maybe Jackson or Groff will manage a win.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"