M4C isn't meant to be there as it is a medium. But you make a tank destroyer competition and you don't put the only tank destroyer the SU has. Garden logic. Again, you put JPIV and not the Su85...cric cri.
Easy 8 isn't exactly a TD or heavy either.
Also for 2 confused lost souls-there is no 2nd vehicle that have as low AT DPS as ISU.