I like Boak. He's a solid bet to push back towards 95-100 range with more midfield time, the reality is he's a tackle and a kick basically from that level which should come pretty easily if he plays 10-20% more of his time in the midfield, there's nothing physically about him that suggests to me he can't get back close to his prime scoring levels, especially with Wines out early giving him a prime chance for a hot start (a big factor in starting him). They seem very committed to Gray rotting in a pocket and Ebert forward and then you've lost Wingard as their top midfielder to finish last year and Polec as their top outside guy, a role Boak does float about in a bit as well. I really like their kids but it's seriously hard to mount a case of them being used over Boak when all are just as competent as forwards as him anyway. I do think Boak is a guy who will fade later in the season as I agree that Port don't look good to win a lot of games to me and thus somewhere around round 14 they might prioritise the kids, of course that could be countered by them finally firing Hinkley and an interim coach that's coaching for a job will pretty quickly stop the stupid Gray and Boak as forward pockets thing and put their two best midfielders back in the guts to try and be better as a team.
Really I think Boak has the strongest case to improve about 7 points in that price bracket (that isn't injured at least).
The other factor for me is that I look at the top forwards coming in and I see Westhoff, Hawkins and Franklin with very strong cases to drop 5+ points. Menegola is also super inconsistent and does have a lot of competition, only takes a couple less 130 games and a couple more 70 games and he also drops 5 very easily. Remove those 4 and then it's case of trying to find players to go 100+ to replace them and the list is pretty short and very speculative, imo. Basically I think the F3-6 range is probably going to be closer to 95 this year than 100+ which again means that Boak's low ceiling actually is on the higher end for the position.