I agree. Was there anything significant going on anywhere in Toronto near there (a big game or big event of some sort)? I doubt that this guy was interested in taking out a donut shop.
Incidentally, I think there is no possibility that he was a suicide. I have a relative who committed suicide in a rather spectacular manner, and I read a lot about it afterwards. People who do things like strap themselves to a log going through a sawmill, set fire to themselves, or blow themselves up want to be seen. This is called suicide "on the head of" someone else - that is, the suicide wants everybody else to feel guilty for all the (real or imagined) wrongs done to him. So this is not the type of suicide for a men's room where nobody will see - just as the OU bomber was not committing suicide on a bench behind behind some empty buses. These were "work accidents."
"I doubt that this guy was interested in taking out a donut shop."
You never know. The purpose is terror, not necessarily a big body count. People can stay away from (and the police can screen) most large events. But what happens when you're afraid to stop for coffee or go grocery shopping.
The message of terrorism is "there is *no* security."
I don't know about any events going on, but the subway in a large city could be plenty crowded on a Sunday anyway. IMO, the reason he was in the restroom was to be somewhere where he could make final "adjustments" without being seen. He wouldn't have been able to do that in the subway station or aboard a train.