Stormtrooper ( imp ver) gains stacking defence for each empire ally , + defence for all imperial troopers himself included . Then when he uses his taunt special he gains. Defence up buff .
At r7 with someone who can mod and a defence leader like gar Saxon, plus him and 4 scrub imps and it's 40% from lead . 40% for each empire ally = 240% + 30% for all imperial troopers and defence up buff totaling 320% puts him at the 90% range .
Stacking buffs of the same type can be deadly or tanky .
Shaak gives crit damage stacking to clones on special plus offence up to ally's on basic it's deadly .
Edit for a quick bit of math .
My savage is at 57.23% defence at R7 with defence up he's at 66.74%
After savage applys 3 debuffs he's at 70.66% with defence up .
Now let's say he gains 2 debuffs on top he's now at 72.80% with the buff ,and 66.74% without it till the end of the encounter no worries about the dispell or having to gain the buff by being hit, now he's tanky without and even more so with allowing him to get to his turn to heal before dying , plus the longer he is in battle now the worse it will be for the enemy .
After 5+ turns he could have easily 10 stacks and with the added speed up and having certain chance to stagger from maul will help that.
10 stacks plus defence up buff = 76.67% a significant gain .
Also if maul inflicts daze and stagger on all 5 Jedi enemies with special he goes from 50.49 % to 60.47% defence
Any defence downs on his basic will add a further 5% defence stacking each time, 3 more basic takes him to 62.71% defence .
If he ever gets round to the special again could get to 68.67% so he's up 18% reducing 10k hit by a further 1.8k