Without knowing the specifics of scoring I think I would have to go with Teo and the 9th pick. Gronk is certainly capable of a big year, but his injury history concerns me. Seems to me that the 9th pick by itself is likely to be more valuable than Gronk and Teo could have a pretty big year.
JDM it is a full keeper IDP league. We keep 40 players forever. We all ready drafted the first round which was all rookies because anyone who is worth anything is all ready gone.
One thing to keep in mind. . Your possibly keeping guys forever. ..Tom Terrific will be 38 in August. Who knows if Gonk will be worth it without Brady.
I'd be awfully tempted. But ask for a 2nd and 3rd, or 1st next year and 4th because Teo isn't all that