I think the discussion is getting a bit off track when people compare what Trudeau did in the House several years ago compared to what Singh is doing now.
The main issue facing Singh is to decide whether having a seat before 2019 would be an advantage and whether it is a disadvantage to be left out of some of the debates happening in Parliament between Trudeau & Scheer.
As I posted above, the CTV Sunday panel thinks Singh is getting left out right now because he doesn't have a seat in the House.
Yes, he is. But there is no election now and the strategy may be to have him more visible closer to an election. This may or may not work but it is a legitimate strategy esoecually since he won't wnat thte cost of a byelection on the party, a request to step down to a small caucus etc. He has other things to do within the party. This might be a good move.
It certainly is legitimately a choice for him and the party to make.