Assuming the Republican votes with a Republican majority. Our side seems to always have the crossers, never the Dems.
Give me a single example of a Republican Senator who has voted for Democrats for leadership positions, and I will grant your point. But there aren’t any such examples. Even the worst RINOs of the past—guys with 100% ADA ratings and 0% ACU ratings—voted with Republicans when it came to committee chairmanships and other leadership positions.
There have been a few who switched to the Democratic Party (just like there were many Democrats who switched to the Republican Party in the 1980s), but nobody gets elected as a Republican, stays a Republican, but caucuses with the Democrats. It has never happened.
I’ll take as many RINO Senators from MA, CT, MD, CA, OR, WA, IL, etc as I can get. They will at least vote with you on leadership and control of the Senate. The alternative is a Democrat who votes against you on both legislation and on procedural issues.
No brainer.