Even if there are multiple scenarios where this can happen, I still think it's highly unlikely. The scenario that you're putting forward is that 1) Aquaman figures out that Jean is a telepath, 2) he determines that she's so threatening that they all have to take her down first, 3) he convinces the rest to ignore the entire team and just focus on her, and 4) they can successfully attack and get through her shields and mental defenses even while being attacked themselves.
All that is very unlikely and I've never seen that go down in a comic book team v team fight. What normally happens is the teams fight each other so that everyone is occupied. If anyone is ignored then that person can double-team another on the op team, so obviously here w/ 5 v 5 they'll all be busy initially with 1 on 1s.
No, no, no you misunderstand what I was saying. I'll try again: My premise is that the members of the JLA "B"-Team are very familiar with each other and know their teammates both offensive as well as their defensive capabilities. That said, 3 possibilities in my example present themselves:
- Aquaman figures out Jean and sends a TP signal to Steel who proceeds in the manner I outlined earlier. If he doesn't engage her in TP combat himself, which isn't entirely out of the question.
- Guy Gardner's Ring figures out her powers and he communicates the same thing to Steel, if he doesn't go after her himself. And/or,
- Steel's sensors picks up on her potential power output/threat level independent of any analysis from his teammates and he goes ape sh*t on her like he did to Triumph in the aforementioned manner.
Just a few possibilities, but never did I intend to say that all 5 members of the JLA squad would be dogpiling on Jean. That's not what I meant. Hopefully I've cleared that up here.