I don't actually think Swarm Leader is very good at all, outside of a few very niche applications.
The requirements for having multiple Evade ships all with your target in arc is not inconsequential and unless those Evade tokens got there for little cost it's likely a net reduction in damage output to have had your support ships Evade rather than Focus/TL. On top of which, expending them in your strike is a net reduction in jousting efficiency (2 'health' lost from your Evades to generate ~1.8 hits, assuming TL& Focus) so unless your support ships weren't getting fire at you're losing the joust more by playing Swarm Leader than by leaving it blank. On top of which (again) is the opportunity cost of what else you could have had in that EPT slot. And as soon as your teammates start dying Swarm Leader becomes wasted points.
So the best use I've thought of for Swarm Leader is a TIE/D Vessery with Tractor Beam/Swarm Leader supported by Inquisitor and a TIE/x7. That squad would generate your 2 evade tokens for free and feed a TL to Vessery for him to Tractor the opponent down then hit them with 2 extra dice primary attack. And because Vessery is TIE/D he's going to be the target anyway so you're not losing anything by giving away the Evades from your teammates. It's optimal in most regards, but probably still worse than just running Juke on Vessery and not bending over backwards in the rest of your squad just to roll a couple of extra dice.
