No cap, this Kendall Fuller isn't a terrible free player card, once fully upgraded on theme team. Sure there's a few caveats and a case could be made the 96 OVR PS2 WW is superior filling the same role... and you'd almost certainly be correct. I'm using Fuller as Slot2 corner with 0AP Flat Zone KO (also has Pick Artist, unfortunately in the same bucket, which holds him back a bit) and he's played quite well, come up big a few times with clutch picks or knockouts.
There's so much to gripe about, but wanted to also give credit where it's due, it's nice to receive a usable card. Perhaps it's worth investing a bit of time to finish the promo if you weren't sure. He's no Sauce Garnder, who is IMO, a near perfect Slot corner... but still decent. YMMV, have fun fam.