
watching live sets on you tube(brazil?),,looks like 3 fingers to me?,,you might do a search for Abe Laboreal,i'm sure i mispelled his name there but you should find him on the web by googling that,he uses 4 fingers
and(sigh) when i really go off and the house is empty i'll drag as much armament as i can into the living room,jam with the Black Keys

,thumb AND 'chicken pickin' (to clarify'pickin',i'm not useing a pick i'm playing the higher registers with my 3rd and little finger and the lower registers with the other two or three as nec to hold down the groove/lead format they do;one guitar and a drummer. so then i'm using 4,it's an odd practise jam for sure but it opens up the mind and limbers up the fingers(tons of distortion) do a search on you-tube; Black Keys live heavy soul HQ,and,

,dime it out!
it's all good practise,i thumb play old(no i mean OLD) country or bluegrassy stuff(although havent been doin the bluegrassy stuff this summer),,2 fingers for the vast majority of rock buuut,,i try to work on dif.technics as well as learning the theory end of it,just keep it fun it'll come to you,ok back to work for me
