Agreed, 100%
Sounds like you've already received the reassurance you need, but I do also agree with those who say the incontinence due to LS is unlikely to be, in itself, indicative of increased pain.
Thank you for being so patient with your sweet oldster. We should all be so lucky to have someone give us the loving care we need in our senior years. Give that sweet ol' boy-o a gentle smooch for me, please.