I don't think that anyone here besides the hardest Axis fanboys will deny that Elefant and JT where OP in team games. The Jackson still has a paper armor though. I had a game yesterday where a dug up Ostwind beat up a Jackson so badly that it had to retreat with a destroyed gun.
Additionally the large range of Jackson is almost twice as big as its view range (afaik 35 to 60). So without a proper spotter it is useless.
Ele/jt lacked a turret and had shitty mobility so could be flanked.
In theory that is.
In practice, the superior range made all the difference. With the jackson, there is mobility and superior sight aswell (40 at vet0).
Armor that can bounce p4 shots (watch the Dave vs talisman game) is not paper and even when it was, it's not a weakness when said p4 cannot even get close to a jackson.