JML is great for the kill x with y feats too. So long as y is a light side toon, but can work with ds just as described above for Rey.
The sector 5 deathmark and BB kills can be worked on at the same time with JML lead, wat, hoda, death trooper and a BB of your choice. Wat places shield on JML to taunt, TM tech on DT, hoda gives teachings to BB.
Hoda and JML use granted special to call BB for kill. DT can get about 3 deathmarks in a battle. The miniboss phoenix can get some revives to make it 6 or 7 kills per battle. Once deathmarks are done add C-3P0 to reduce cooldowns on JML and hoda, as occasionally JML has to do a damaging attack otherwise.
JML lead is strong enough that you can use this while progressing through the nodes, but of course won't count for all LS feat.
Hopefully they fix and bring back the LS and DS feat.