I understand what you mean.The teleport cancel just makes scorpion safe, as johnny has alot of slower starting strings.
Searing rage just allows johnny to get his highest damaging punishes, but it is by no means a uphill battle
To be honest Searing Rage is almost as safe as Reborn and not the cancel makes it (except B2, F42, F3-tele) - highest damaging punishes should not be allowed much more.
I agree that Reborn is more safe as he can choose to come out of blocked strings instead of staying close to Johnny (this is in general). And of course if SR goes to DS/tele/F32 on block - and it is in general a potential.
And SR can "counter" slower starting strings as much as Reborn if you meant to teleport - but yes I agree that Reborn "on read" can cancel it and punish while SR needs to commit on read. On reaction it does not matter.
Are you in EU or close to it? I would learn and get Johnny MU exp with good ping any time with friends.