"The actual weakness is possibly Ringo himself, he manifests Mandom and the watch, when he can instantly do it by just simply thinking,"
No
Stated 3 times he wouldn't be able to turn back time if he couldn't interact with his watch.
"he plays by "the rules" with Gyro like it's a gun slinging duel instead of making a easier approach and attack, but much like most "humble" minor villains he showed himself out there with confidence in limiting himself and being vulnerable."
He never stated he was gonna hold his ability back just to "follow the rules". It's outright confirmed he NEEDS the watch.
"Damn...6 seconds are going to pass"
Also hints right here he can only do 6 seconds each set. He can't just spam the ability.