Couldn't agree more. Even if a turreted 120 is a bit down the road a dismounted 81 is better than nothing in the interim and will allow the training with integral fire support.
That sounds suspiciously like MRS and whole fleet management. I don't disagree that we might have trouble sustaining a full brigade in sustained combat and will have to dig into the other brigades and reserves to do that. I just think that we should be structured as equipped and organized brigades to start with.
I'm with
@TangoTwoBravo in that our infantry battalions are pretty much there.
Building on the above, the heavy brigade really doesn't need three infantry battalions if it has a full armoured regiment. It already has three manoeuvre battalions to work with. That leaves the armoured regiments recce squadron and a light infantry battalion as the core around which a cavalry regiment can be built.
That leaves four battalions worth of LAVs which can be used to build that three-battalion medium brigade with it's organic armoured recce regiment converting to cavalry. As you suggest, with the third brigade light you now have one battalion of LAVs unallocated and capable of other tasks.
Okay. Here's a suggestion.
The current eFP battalion led by Canada already has a fair amount of armour in it. To create a full ABCT you would only need to add one armoured battalion and one LAV battalion (plus cavalry, artillery, engineers and CSS).
I've mentioned before that I do not know how the eFP bn fits into any Latvian brigade structures or how Latvians M109s are allocated but for arguments sake if we say that the eFP battalion is assigned to a flyover Canadian brigade then one could preposition an armoured regiment with three squadrons, one additional mech bn of LAVs (remember I said there was a spare one) plus the cavalry regiment and all the requisite CS and CSS gear.
That leaves two tank squadrons in Canada which is sufficient for shared training for the three squadrons (who could also do flyover training).
The tanks and the LAV battalion are actually the easiest part to predeploy. It's the rest of the establishment for a brigade that would put pressure on Canada.