While Oscars were more likely to carry bombs, it would have been on a strike mission, not ASW patrol (or maritime patrol, period). In fact, the pathological inter-service rivalry between the IJN(AF) and IJA(AF) would not have allowed it, frankly. ASW was the IJN's bailiwick.
Bottom line is that single pilot planes would not be patrolling for surface contacts. Frankly, they so often had no radios that them sending contact reports is somewhat dubious
