I'm not sure he's box-to-box per-se, how often is he busting a gut to the attacking box?
He's a solid championship midfielder but with his limitations (he'd be a league above if he didn't have any).
Most crucially, I could never really see him helping Rovers cross that 6th place, or 2nd place line - it wasn't uncommon for him to go missing in the latter stages of the season. Sam Morsy kept him out of the team at Ipswich, and I think that sort of backs-up Yeti's claim, he'd be more of a squad player for a team with ambition to get out of this league. (judging by Eustaces signings Derby are not that).
I'd obviously much rather he be that squad player here at Rovers, alongside Trondstad, Tavares and Baradji, as firstly, two of these are unproven and secondly it's likely we'll have injury issues and drops in form at some stage.