Wrong my dude
You can actually fight him early but if you go aggressive (which you should).
Deny him rage, same tactic really for Tryndamere, be the first to the lane and begin beating his ass the moment he starts trying to build rage (because rage fighters require rage to ((SHOCKER)) be effective!).
If you dont let him empower abilities you will see he is far less troublesome and if he does decide to empower abilities that means you've hopefully been smacking him that entire time and he is low on the HP and will either heal up or try to go for all in himself.
I play top with Trynd when i get filled and I can tell you top vs ren is a rat race to first blood because whoever gets the item lead, can pretty much change the flow of the lane. Ren can be a big bully who you have to cs to out-scale eventually (and you will out-scale because his scaling ratios are trash) or WIN the trade from the get go and have an easy lane.
note if your jungler doesnt know or understand the commitment that lane will cost you then he is basically not playing his role by supporting you because by going aggressive you become a target for the opposing jungler.... that's the weakness in this strategy.