Swings and understudies are very valuable as they cover multiple roles. Easier to replace one role, then to find one that can do multiple roles AND take the time to learn them.
As for Seth, I really loved his Jefferson, but not so much his Lafayette.
I see two possible scenarios: someone fell through or they are waiting for someone that has commitments to free up.
That being said, I don't ever remember having a role go unfilled for such a long period of time before.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.