When playing a line that goes up a fourth – same fret, one string up (e.g. E-string 10th fret to A-string 10th fret) my fingers other than index simply won’t flatten out to fret both of them, for me it’s either anatomical or age-related, but nothing good will come of my trying to force the fingers to do what they can’t. So I usually tuck a different finger under, e.g. play the E-string 10th with the ring finger and the A-string 10th with the pinky, which my hand can do. It would be a lot more convenient, though, to have my pinky just jump from one fret to the next, fast, but I miss a lot. Does anyone play that way, with jumping fingers? Maybe it’s one of those things like slapping, which is inaccurate at first 'til you slowly get more accurate?
Yes you just answer the question, 
There are many ways to do it, you can bar the same finger, index and pinky are the easiest one. You can roll it which gives better control of muting. You can use different fingers some songs I “have to” use this technique because the demand of muting.
Go really slow and once you get it you are on autopilot.
For me, it depends on the bass line, sometimes I do the finger roll, sometimes I use two different fingers, whichever feels easier to me after a few tries.
For Billy Jean, I think Josh teaches it with two fingers for the A and D string on the same thread. So it can’t be wrong.
“For Billy Jean, I think Josh teaches it with two fingers for the A and D string on the same thread. So it can’t be wrong.“
Thanks, Great point. Some of my fingers can’t do finger roll, just don’t bend that way, so I’ll just do the best I can with some choice between tucking and jumping/sliding.
Jumping fingers can be tricky but improves with practice, like slapping. If tucking a finger works for you, stick with it. Try both methods to see which suits you best.