Yes, that will definitely be a key to determine if it’s opening when it looks to be finished, like how Rat appears to be close to finished (though they havent finished inside the ride building, nor have they restarted since the closure), and it’s telling that they’re not opening it any time soon due to CMs not being brought in to train at the attraction. But with Tron I think it’ll be a little bit different. Yes, the imminent opening of the ride will be pseudo confirmed with the training of CMs, but I dont see this attraction standing dormant very long after the completion of the walkway over to the ride, as I assume that will be one of the last things constructed.
Let’s not forget that the WDWRR reopening is dependent on Tron’s completion as well, and considering what trains meant to Walt, and it being an opening day attraction, that’s probably one of those attractions that kind of needs to be open on the anniversary