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I'd put some FIPG on it. The little groove falls in line with the other grooves on this pan and the big groove *I believe* is for the engine rear main seal. Look up the rear main seal installation in the FSM and see there's a mention of putting some FIPG on the seal itself. Since you aren't doing the rear main seal, chances are that you may need to clean up the old seal so that the new FIPG can do it's thing.
This is pure conjecture and going off of old memory....
Just had a yota mechanic look at it and he said it's NOT the RMS ,,, but it's so wet under there that he can't tell ... so I'll degrease and pressure wash it underneath to have it clean for him for next week... he thinks it's the oil pan
so I took it to that real yota mechanic and just got the call that its the upper crank shaft seal. They ran dye through it and thats what they said it was ... it sucks not being a mechanic , cause this is gonna be a $1500 fix ... I guess the mods will have to wait awhile. He said for that price he'd redo both oil pan gaskets, the upper arch seal , and tranny pan gaskets as well , then said he's make sure the leak is taken care of and all the other stuff that may be leaking .... which he said the power steering unit may be leaking as well ... It is what it is ...
that didn't include the jar of Vaseline it appears!!