Yes it is! For some reason, I was thinking during operation, part of the mainshaft would be in oil, but it isn't. Thinking more about this, there was no oil in that area upon initial disassembly, I would have seen that. So I believe the reason for a bit of oil to show up there is that I've been transporting/moving the trans around and tilting it so much that enough excess oil has drained back into the rear to migrate a tiny bit out the splines. Reason for removing the trans was to address a significant leak down the front, which turned out to be the countershaft hole, which I did do with a high quality RTV after thoroughly cleaning. Oddly, the gasket doesn't cover that countershaft hole, and it isn't counterbored for an expansion plug, and it sits well below the oil level. Think I'm all set, I hope to update this post with results after reassembly/operation. Thanks all for the great input.