Players have deadly gladiator boots and belt with rating from last season?
Dont know what you are asking. I got S3 and S4 glad on the EU original TBC. S5 is the start of WoTLK seasons if I remember right but I never played in that. Didnt touch arenas again until S7 a little bit and then a lot in S8.
S4 is from TBC S5 is WoTLK.
All that carries over from S4 to S5 is your gear that you have on, not your CR or MMR. That all resets with S5. You can get filler S5 pieces doing the WG BG. The raid. It drops some if I remember right.