There are forum posts about getting 7* Yoda by using Barriss' health drop exploit. Tried it several times and it didn't help at all. Maybe works for whales with a better Jedi team, but didn't work for me with my free one.
Here's what worked. Yoda was with Jedi Consular and Jedi Knight Guardian. My team was Barriss leading Qui-Gon Jinn, Luminara, Jedi Consular, and Eeth Koth. JKG would use Saber Throw and gain Defense Up. I would then use QGJ's Humbling Blow to give everyone Offense Up.
First, take out JC to prevent healing and because he's easiest to kill and not needed. Next, start attacking Yoda, and leave JKG for last as you want to use her for free buffs. May work with other Yoda companions, but JKG is the slowest Jedi.
