Ideas to improve synergies between Mandalorians

Far, ISC and Sabine still too weak with these synergy.
Sabine's passive is really weak since she's not sharing it other than phoenix.
Gar Saxon labelled as a tank, but he's not taunting, hits like wet noodles (even at R5), and there are too many things prevent you to counter attack (and assist them) these days, something like +30%tenacity to his leadership might do the job.
ISC, same as above, need something like passive tenacity or tenacity up for keep countering.