He's not terrible, he's not great. But he's a wildcard and thre is some baggae as mentioned above.
Texas would want him, they always did. Heck, they even need a better backup catcher and Thole's numbers look decent right now. You could possibly even get something really good back from them.
But then you have to go and get another SP yourself. This might be possible in the off season when you can sign a free agent to replace him, but likely wouldn't work right now.