It would seem to make sense not to delay reinstatement simply to sort out trackside facilities, Of the ones I can think of, Washago and Bracebridge were only shelters anyway. Where former station structures still exist intact, they are mostly municipally or privately owned so negotiations for space would have to occur.Do they not know that the Canadian runs from Sudbury to Toronto? I guess they would still need to certify the northern section.
All of the stations are in place, you could start with portable toilets or trailers and heated shelters instead of opening the station building. Portables could be used as ticket booths.
Don't need to do it properly the first time.
I don't recall for sure, but I thought they went to online booking even before discontinuation and dropped the need for agents (but could be wrong).