It's not about 4 and 5 tight ends, it's about grabbing talent in the draft that you can build with. The tight end position, probably more than any other position on the roster right now, is an example of what you should have, at minimum, going into the draft. Kmet still has some potential, you like Horsted as a situational pass catcher and we got a guy with starting experience on the cheap who can play and not be awful. In terms of entering the draft, I don't have to pick a tight end in order to avoid trotting out some league-worst talent at the position.
But, there's not enough there to stop me from grabbing an impact player if the opportunity arises. If I've got a 3rd round grade on a guy like Charlie Kolar (just for argument's sake here) and he's available for me in the 5th, are Jesper Horsted and Ryan Griffin going to stop me from taking a guy I feel is a plug and play starter as early as this coming season? They certainly shouldn't anyway. And if I've done my job as a GM and made sure as many positions on the roster are in a similar spot (at least some passable starters) then I shouldn't feel the pressure to HAVE to draft a certain position and thus take a 5th round graded corner over a 3rd round graded tight end. That's how I build a team over the long haul that can compete and that can eventually afford to lose guys to free agency (and thus get comp picks) because I'm never really drafting guys because I need someone to play his position, I'm drafting guys because they're consistently the best players available.
Of course this only works if the GM/scouts can do a good job identifying those guys. That remains to be seen.