Jay stopped fukking with Irv for a bit because Murda Inc started messing with Nas, and even tried signing him, which in turn burned them because Irv said himself that as soon as it was time to sign the paperwork, Nas just disappeared on them. Irv said in retrospect that he should have never did that cause him and Hov's relationship was never the same after that.
Jay-Z also outsold 50 and G-Unit at their height when released the same day.
As for the shoes, the S Dots were dope because of the Gucci resemblance, but the G-Unit joint ms were always ugly to me.