I think u are still confused of what is meant by position. Looking at what u said: u mention about slot 3 and slot 6.. the slot has nth to do with ur ninja position. When opening up ur team, u will see exacfly which of ur ninja is in position 1, and so forth ( although with experience, u can definitely learn about all these). Ur fren's tobi probably use skill faster than u because his tobi is in position 1, while ur ninja is not..