Although you may be right that these three might be better options than Ebron, their draft capital will cost you more and again...they're dart throws not a given, just like Ebron. Engram does not have a QB, and besides Barkley, the giants will be a mess offensively. Howard has Brate to contend with (same as your Doyle argument), as well as Winston throwing him the ball. Hunter Henry didn't play last year, why is he not a dart throw?
Although Luck's injury is a concern, I'm fairly confident he'll start the season and I don't draft next week, nor the week after, so I'm not concerned at the moment with any minor injury reports of players sitting out preseason games. Quite frankly, I don't think Doyle will avoid IR for at some point during the season.
I don't draft top TE's, I'd rather put my $$ elsewhere. I look to viable TE options that cost substantially less but who have solid QBs. Ebron fits that bill, I would also argue that Jared Cook and Vance McDonald are good and likely cheap targets as well.