He will probably dominate in DV, but will need lots and lots of OD to be good in a higher level.
Like maybe 11 OD for D4?
At 25 he's too old to get there. With a level 4 trainer, if you single position train him in Pressure every single week, you may get him to 9 OD.
He also needs stamina.
I'd get some 18/19 year old trainees and use this guy at SG, then make him a backup after you promote.