You think? Last game he was in goal, Lahti lose 1-0 at leaders KuPS.
Lahti's next match without Oluwayemi, they concede 5 goals at 2nd placed SJK.
The other keepers in their squad are a couple of teenagers (17 & 19). Oluwayemi has missed their last few games because he's either been injured, or Lahti have known he's off to the ALM.
However this is all unimportant stuff. Parker & Chief would have scouted him thoroughly. They know what they want. Again the right keeper is absolutely crucial to how the Nix play, though as with any visa player there is always some degree of risk it doesn't work out. But he's likely their most important signing over the off season so they will have done their DD.