THIS IS MY OWN OPINION NOT CM TEAM:
Now as a zeus, i'm not going to cater to a invincible tank nor will i be teaching other zeus's how you can kill it.
Now the testing i did, It took 40 BLOODY AT MINES... 40. I fucked about with SMAW's, TOW's, RPG7's, And RPG-32's, The only thing that would do enough damage in one shot was the TOW, So for me the Chally would never get used in my missions since i only use the RHS units again, got bored of future units.
If you'd watched drago's video He shot it in all the weak points, i tested it also and shot the tank in all the weak points i know, again it didn't do much.
Personally on my zeus mission's, I'll never be using the chally2 until i can kill it with AT Mine's. If i ever have a chally2 on a mission there will be SU25-KH29 Russian jet planes since those things can kill the tank.