In short, yes, that is correct.
Over the years the tolerances and dimensions from the original TM gearboxes have gone all over the place with so many after market parts, one of the issues this creates is pistons sitting (or more specifically, the first pick-up tooth) too far forward so the first tooth of the sector gear only partially engages with the piston until it has been pulled back and the next teeth are engaged.
On high-speed set-ups this can result in the first tooth being snapped clean off the piston, in standard to mid rof it means the load is only spread over a small surfac