Currently in my 12 Team PPR Dynasty, Sanu is WR55. This is clear WR5. No argument. 33 rec on 42 targets 313 yards 1 TD (average 4.7 rec 44.7 yrds) 10.1 pts/gm
A small gain of 1.5 pts/gm would bump him to WR43, into WR4 range (Ju-Ju & Landry range). That is only 1 extra catch per game. Easily within reality in a higher scoring Off.
I expect his overall fantasy production to increase a couple of pt/gm (like 2.5 - 3.0 realistically). This would put him WR36-38 range (OBJ, Woods & Fitz) & make him a low end WR3. This is also plausible as it is only 2 additional catches per game for minimal yardage. When you consider his Red Zone abilities, that really bumps his "potential" value in NEP.
If he gets a healthy 4 pts/gm bump, we are talking Top 30. This might be a stretch, but it all depends on his usage. Brady wants weapons. While nobody has come out against any of the current WRs, the fact they have been pursing Sanu since April speaks volumes to me. And when that effort came up empty in April, they drafted Harry (who is soon to return).