if Corbyn could get his party in order and align with all the rest of the others they could take the decision out of the tories hands?
If he wanted to be in the Brexit hot seat he certainly could. Indeed, if he was a remainer he could join with the majority of the opposition parties to form a ‘single issue’ government, stop Brexit and immediately after call an election. [1] We’d be back to where we were in 2015 and each of the parties could then campaign on Leave or Remain ticket as they wished. [2]
But then if he wanted to to that he already would have, there would easily be enough Tory remainers to make that happen.
Instead winning power is of no interest to Corbyn, in fact the only two things Corbyn is interested in is leaving the EU without getting the blame for it and killing the Labour party. He’s making a good go of the first but will ultimately fail, and has already succeeded in the second.
[1] It’s easy to circumvent the fixed term Parliament Act.
[2] I think it’s safe to say that all except UKIP would campaign to Remain.