trans pan leak battle

so your old transmission leaked at the very bottom
now a newly rebuild one also leaks at the very bottom

what are the odds something else is leaking and you're simply noticing it on the bottom?

the reason i ask is because i struggled with a leaking oil filter adapter for ages
only to find out it was actually a leaking rear main seal, and the oil got slung up by the torque converter unto the oilfilter