He also tried to pull it off within his 2 year stint instead of building up to it - if he'd gone for a "this is how the job should be done" 1st round, made sure that other temples were ho hum/failed, then when IHH's turn came around again they'd be more likely to get a longer period - assuming that he couldn't get elected at some point as a regent-Pontiff following some major foul-up by a successor, or get a "supporting role" made that he could maneuver into and use to maintain a measure authority.
Any attempt to win a major agenda in 8 seasons (well, 10 thanks to WIT) from nothing flat is doomed to failure in my view, they are more decades-long goals rooted in the heart of an organisation in my view.
He wouldn't get the second chance within the scope of the game.
I know that it's been answered, but to me "game length planning" is what causes most PBeMs to be d4-1 (which RoE II thankfully avoided).
I worked from start to finish on generational planning - Robhan's aim wasn't to complete all agenda's in 20 turns, he had no reason to think that the next 5 years would be "special", Robhan was working on a "over the next century how will the Aegis and my family be best served by my actions" approach. Robhan lost out through changeovers in players but that wasn't something I'd allow him to plan for either. As a player I knew that it wouldn't get me points, but I think that the lack of a quick-get-rich-and-win mentality made it easier for people to play with Robhan and, in my view, made him a more rounded character.