It's very possible that they are more gifted than we realize, given dd7's spontaneous reading at 2 and the way Ds6 problem solves, but it isn't something that's too important for us to figure out.
I'd recommend adding a "for now" to that statement

They might be MG or you might come to realize that that doesn't quite fit. It sounds like you're on this path already but from a BTDT perspective, listen to your gut and be open to course adjustments if needed.
(My BTDT story - we thought DS was MG (tests agreed at the time) and couldn't figure out why nothing that the school was proposing/attempting seemed even remotely appropriate for the kid we knew at home. A couple years later we had to retest to confirm some 2e stuff it was kind of a shocker when he tested much higher. The disconnect between the school's solutions and actual need made a lot more sense with the new results.)