Just giving my own thoughts on this, but Oro expected us to keep teaching him after that one update focused on that. My personal reaction to that expectation was to wonder what it would actually mean for Hazo to keep teaching Orochimaru Runecrafting beyond the point shown in the update? The first and most obvious answer would be to teach Oro the specific runes that Hazo already knows... that list is very short. The less obvious but still rather straightforward angle is that Hazo teaches a bunch of mumbo-jumbo that would be meaningless to write out but effectively just translates to mechanical levels which is boring but plausible.
And finally, I considered the possibility that in order to keep instructing Orochimaru and help him improve his runecrafting, the most optimal angle would be for the two of them to do research together, with Hazo taking the lead and preventing accidents while Orochimaru learns from and contributes to the process.
Or in other words, doing rune research in Orochimaru's basement doesn't have to be separate, 'in addition to' teaching him. It's not night and day if It's literally just the next step in the process. Of course, this would have the downside of Orochimaru having access to any runes we try to research, and to a lesser extent getting his agreement that a specific idea is worth investing research time into. So its not without downsides. But that is a given in any plan that involves research in his basement so that's not exactly a new consideration.
I will enthusiastically vote & advocate for any plan that develops Hazo's Runesmithing veterancy. But I think that we're slowly getting a picture of the choice set facing us:
Timeline milestones:
* 20 days to clear the Consequences
* 80 days to get access to the TH stunt
* N days until the Crusade's Feast of Dragons.
XP wishlist:
+ 600-1000 XP for combat fundamentals
+ 1200 XP for build unfuckery via lightning jutsu
+ ~235(?) for BoC 30
+ 360 XP for TH 10
Research priorities:
? cycles of Veterancy Chain fodder, which I think is more important than the hivemind has recognized in the past
? cycles of SSA for RRB, 4Fseal barrier, other Jiraya tier effects / combat-tier loadout iterations
? Cycles of SSA for non-necromancy Minatoseals
? cycles of Rune experimentation [maybe outside of Leaf]
? cycles of SSA for Necromancy seals [definitely outside of Leaf]
Fungible Wealth Extraction:
€ Liquidating Goketsu social capital
€ Milking Leaf for tradable resources
€ Begging for apprenticeship XP