[chaos]

I might also play some high only hands with a 9 in good position. They are not as good as having all four cards 10 and higher.

With these high only hands you are hoping to flop a straight draw and two pair or a set. Then you can play the hand strongly. I only want a single gap in the sequence other wise it is too hard to flop a straight draw. Being suited or double suited adds some value. But you will not likely be drawing to the nut flush so their value is better when the flush draw is backdoor.

Some exmaples without pairs are 9TJQ, 9TQK, 9TJK, and 9JQK.
Hands with pairs include 9TJJ, 9TQQ, 9JJQ, and 9JQQ.

I do not give much value to having a pair of 9s or 10s. Even the hands with a pair of Jacks are marginal. But in position in an unraised pot, I think it is worth seeing a flop.