I dont see Bont and Trac getting DPP myself, although they spend time forward they attend virtually every CBA.
Historically the DPP changes in AFLF have avoided the top scorers so those guys would need to have pretty terrible seasons to be a chance.
I think the CB stats is a myth used to cover for changes they don't make because the player is too good. For example, last year Danger and Martin were both forwards despite both attending >65% of CB in 2020, which would mean it's impossible to be 35% or higher starting as forwards (even assuming they were on the field 100% of games it wouldn't be possible).
This year Stringer started as a forward despite attending almost 70% of all CB last year, again making 35% impossible. Martin last year was at 71% and is still a forward.
It's been 5 odd years of it in AFL fantasy and they've still never released what their criteria actually is or the stats that support any of the decisions at any point over that period. They definitely don't want people being able to work it out in advance, aka they want to make it luck based and not skill based.
If you throw in Ultimate Footy which also does position changes you get quite a lot of differences, theirs isn't any better or more transparent outside that they sometimes post a "on the radar" type post but basically they're using the same source data. They've been honest in the past that they don't make changes sometimes for balance reasons (eg. Petracca last year).
I want to like the feature but their refusal to remove the cloak and daggers makes it impossible. If you did a post after round 4 saying these are the guys on the radar, we can plan around that, alternatively if you'd tell us exactly what the criteria are, we could at least make educated guesses. The last couple of years it has been exclusively fallen premium mids that played forward or back a bit that get the changes, they've genuinely used it as a mechanism to "save" people from bad picks, which from a commercial perspective I fully understand but it makes for a terrible mechanism for competitive purposes.
To be clear, Petracca in DT did not fall like he did in SC, if he'd been SC last year then he'd probably have qualified. Last year it was Hunter, Fyfe, Billings, Darcy, Kelly and Pendles that were the names that come to mind that got changes. Of that group Darcy was the only one who hadn't had at least a 10 point drop off from their previous season, most were 15+. But they weren't giving it to Petracca or Steele when they spent a month+ playing as forwards.