Yes, but there is a problem, boss sometimes doesn't hit tank for many seconds (while casting etc), if I track it every 2 sec, tank will not be there all the time (yes he can be find by addon as melee but not always he hits boss every 2 sec), and I can't know if he is still tanking or offtank took the boss already... This changes the position a lot:
first 2 sec:
melee, boss, tank:
*** B T
2 sec later:
melee, boss, (no tank)
*B*
2 sec later, tank made a hit:
melee, boss, melee(tank):
*** B T
Well yes, I can check if the position was changed because there was no tank and then in <5 sec was restored - change the positions between the 1st an the last one, ufff, well To try a little complicate