I'm not a CO f/a, but I have several friends who are. I'll email them with your question. However, I would doubt that IAH is understaffed.
Houston is by far the lowest cost city of the 3 CO base cities and has the best weather year-round. It is a very desirable base, and therefore is the most senior. If there were a shortage at IAH, my guess is that there would be people clamoring to transfer there.
Trust me, if you live in/near CLE or EWR, and you spend one winter in Houston where a chilly day is a day in the high 50's, and
maybe two light freezes in 3 months, you will not want to go back.
I lived in Houston for 34 years. I can't tell you how many times I had to listen to people who had come from the Northeast b*tch about the summer heat and the traffic and the lack of a decent bagel. They would then go back to the Northeast in the winter, and change their mind about Houston's shortcomings.