What surprises me is that the TSB made no comment about WestJet deciding that this was a non-reportable incident.
Is an Airmiss a reportable incident in Canada? SFO was similar to an airmiss, albeit one target was on the ground. This was a severe groundmiss, again one target was not airborne, but you get my drift. If a 1nm airmiss is reportable, but a 40-60' near crash is not, that sounds confusing double standards.
Regarding the continuous descent after MDA & MAP; at the worst, if no immediate GA due no visual reference, is a level off at MDA. It also smacks of 2 heard outside searching for the target and no-one minding the office. That is a MCC training culture and company technique. In my airlines, even if they might have been SOP nannies, they had very strict crew duties during NAP's, even all approaches. No confusion and IMHO were excellent. Never 2 heads out or in.