TD had some "interesting" coaching changes in the last year and a half...from the departure of the long-time coaches of their 2-a-day L10 JO practice group (and the practical demise of that group) to changes in their Dream Team coaching (elite vs JO).
But let's not focus solely on them. This is Texas youth sports, afterall. All of the top performing gyms are working to establish and maintain a reputation. They will not advance (try out for elite, promote for college recruiting) an athlete who makes them look bad.
Don't know how old your kids are, but one thing to seriously focus on is the track record of a gym for developing gymnasts from compulsory to early optional to later optional levels. Are all the L10s home-grown or did they come from somewhere else? And if somewhere else, is there a pattern? When gymnasts at upper levels leave, was it due to injury or did they go to another gym? Find out how the gym manages injuries (IMO, none do a good job).