Biggest takeaway from this thread?

I found someone who actually reads EnRoute.

I am very confused: Where were the concierges? OP on J INTL Arrival?

I guess concierge training in order too?

A bit TLDR, but some comments about how the concierge makes all the difference from the "peons" (a word upthread) in the back. What about the "peons" who paid to sit in the front?

OP here. Concierges were nowhere to be found. My guess is this is due to the miscommunication. AC "thought" they had rebooked me on the 6:30 flight, and since I got off the plane at 4 pm, I wouldn't need an escort to rush me anywhere. Little did I know (and apparently AC didn't know either!), that I was still on the 4:30 flight.
Actually, I'd be fine without an escort, but I would have greatly appreciated someone calling the gate and saying that 2 J passengers are on their way so don't leave without them.

I wrote my note to AC and will report their reply here.

Ouch

5AM + French as a first language

I wish there was a concierge every time I arrived in to YYZ or YUL on a delayed INTL connection. Sometimes there is and they can really help, which I really appreciate, but other times they are nowhere to be found. I suspect this is less "concierge training" needed and more that they don't have enough of them and sometimes they don't have anyone available to meet the plane.

Two weeks since I wrote to AC via their website, and a week since I followed up. Nada.

Is there a more direct way to email someone rather than the feedback portion of their website?

Not really. At least not in an effective way.

But you can always try their social media sites.