Oil leak

Yea the rear main seal would suck. Look into the area where the adapter connects is it coming from there or is the whole adapter clean?

there is not two oil filter seals on the oil filter is there. When you removed the oil filter the last time did the seal stay stuck to the motor? It does happen i have a buddy with a viper he just did it to and he took it out and oil was going everywhere luckily he shut it off in time and had it towed home so he could fix it. Now he was out revving it pretty high and stuff so that is why the oil went everywhere.