Listing appearances like that doesn't tell the whole story does it. His championship season for example, it's 25 appearances but only 10 starts and a total time on the pitch of 945 minutes - so 10 and a half games worth of time on the pitch across an entire 46 game season. Granted he didn't get a goal, but playing under Martin his role wasn't to get in the box and get a shot away it was to recycle possession endlessly. Taking his assist ratio and putting it across the whole season and suddenly he's looking at 15+ assists.
In a Still team that switches it up from passing to direct counter attack football, a speed merchant with close ball control like Sulemana would thrive in my opinion. But I guess with Edozie coming back who can fill that role, they've identified Sulemana as a good source of funds to help improve other areas of the team.