I mean yes elefant is good mobile big pak, but hardly enough to zone out, at least in 2v2 i play. Just do a rush of t34 or sherman and i got to back padel hard
Again, that's going to have more to do with you than with the unit itself. The Elefant is enough to dominate all Allied armor, and is very hard to flank when it can see enemies coming from miles away with spotting scopes and when it's properly supported with Pak 40s / Schrecks or other tanks for support to prevent a dive. The ISU-152 does not dominate the meta like the Elefant did and still does.
Also, fun fact, the Elefant is actually better at dealing with flanks because it has better gun traverse than the ISU-152. Top Speed hardly matters there. The Elefant has a faster reload, higher alpha damage (which means two shots and a faust can kill a medium tank or a TD) and doesn't need to switch shells first. The only advantage the ISU-152's got here is slightly higher rear armor, that only helps against Panzer IVs because the Panther, Jagdpanzer IV and Stug ausf.E are guaranteed to penetrate it at any distance.
Go watch the 2v2 Masters Cup here and tell us how many ISU-152s you saw compared to how many Elefants. These matches show how dominant the Elefant was in most games, and how incredibly hard it was for the Allies to take it out.