Almost every CBG is implementing tactical grouping with its infantry and armoured units. As the army makes the transition from ad hoc battlegroup ops to divisional ops, it has been identified that the reserve units need to be capable of deploying formed sub-units and operating effectively. With most units current authorized establishments being in the ballpart of 180-230, even at full strength, a reserve unit can't consistently put a coy in the field. By grouping units, it takes their authorized establishments to close to their reg force counterparts. This will let units start training with a company in the field sooner, while DND, the MND and PMO begin the process of actually increasing the authorized strength of the army.
In town halls over the last month or so with both a CBG Comd and a Div Comd, they both said the vision is that reserve units will have the same authorized establishment as their reg force counterparts. They also said that being un-tactically grouped was tied to two key metrics, the first being able to reliably and consistently put a company+ in the field for exercises (ballpark 150 all ranks), and second, approaching the size of a reg force battalion.