With the assumption that the Tuck saga is Tuck Prime or Tuck 'then what other time lines are there?
I see the seasons or Tuck " as the second line.
Then there is the line that resulted in I'm Not Alone...
The I'm Not Alone line actually diverges at the convention in LA because in it though it is near the end of summer Tuck is still with Debbie.
Then there are several Anti lines if you want to call them including Tuck suicides in April, Tuck goes to Boot Camp, Tuck misses the mafia (if Ellen puts the mafia that is implied in Tuck Squared in the improved version of Tuck seasons...)Tuck decides to disappear from everyone who knows him when he escapes Jane.
Tuck dies when the Jocks Attack him.
Meet the Tuckers time line.
And of course many more that I haven't thought of.
Tucky Seasons, Tuck^2 (Tuck Squared)
I'm Not Alone
Meet the Tuckers
The first two are on Ellen's Website, The next one is in the Fan Fic section here.
Tuck Squared seems to not involve an actual Tuck prime when Val meets Tuck as that Tuck had decided (or been pressured) to take testosterone shots among other differences between that one and the main Saga Tuck.
So I see at least four time lines that have been partly explored by various authors.