The whole veteran term was something that was made up by the fanbase specifically for Perospero, Daifuku, Oven, and Compote, because out of all the BMP at the tea party those four were the ones that were hyped up alongside Katakuri and Smoothie. It has nothing to do with being in the service for too long, we know that some of them like Amande have been with the crew since birth however none of them with the exception of Perospero, Daifuku, Oven, and Compote were hyped up alongside two Sweet Generals.
Also no they are not all called Yonko Commanders only the Sweet Generals are called that, all the other children are officers of the crew not commanders. There is a reason why Katakuri, Smoothie, and Cracker are called Commanders or Generals(depending on which translation you read) and why none of the other children are called that, and it's because the Commander position is the highest rank of the crew. The rest of the children are just the officers and the ones that aren't children like Tamago and Pekoms are the combatants, as for you saying that characters like Mont-d'Or, Tamago, and the others are on the same level as Perospero, Daifuku, Oven, and Compote no they aren't.
Pedro who was able to easily take on Tamago was having trouble fighting against Oven and was easily defeated by Perospero, Sanji who one shotted Raisin was easily pushed back by Daifuku and his kick to Oven only hurt Oven for a little bit. So no those other children are not on the same level as Perospero, Daifuku, Oven, and Compote, and yes we know the whole veteran term means someone who's been on service for too long but when it comes to the BMP we just specifically use that term only for Perospero, Daifuku, Oven, and Compote because again those were the only four BMP at the tea party that were hyped up alongside two Sweet Generals.
