When you see lightining you always get 3* from unknown and 4-5* from ms and crystals. Lets say that you saw lightining from unknown scroll, if you used ms or cryatal summon instead of unknown scroll you would see lightinings and get 4-5* instead of a 3*. I mean it is fixed. If you will see lightinings you will always see that no matter which type of summoning you use. If we could see will there be lightining on our next summon we could always get 4-5*. Hope you guys undsrstand what I Am trying to say.Sorry for bad English.