Yeah, it really does feel like a crossroads at the moment.
The most obvious and rational decision is to give it to Sheehan. There are probably no more reasons left not to.
Or, they can take a step into the unknown, armed with their laptops and their stat packs, and somehow engineer a way out of making the obvious decision to give the job to what would be a total punt. And off we'd go again, likely under another "trust the process" manager. Unless the owners are prepared to fly in the face of FFP/PSR and lavish superbucks on the team to support them, it will fail, just like it has the last 4 years.
I hope Montague has the courage to do the right thing.