It's good that Republic isn't making people wait until March or April for a class date. They have been working hard to beef up the training program to achieve their goal of 90+ newhires a month. That's why a sim in Dallas was added and I believe they stopped doing in-house ATP-CTP. They don't want a repeat of late 2019 when they paid trainees 75 hrs/month to sit at home for 4+ months because of training delays.
I don't know much about Endeavors training but according to their Facebook page, it looks like classes are only about 12-15 students at a time. I imagine that's a big reason as to why classes are so delayed.