Choosing Team Mates for Battle

This is really a three question topic. When I choose a team mate I see I can pay 100 coins to change that team mate. so when I pay it and look at my choices I notice in the upper left corner of the different characters a small but varying cost of that particular character. So does the cost differ in their strength and/or weaponry? I also have noticed in the lower right corner there is a little round clock that shows increments in seconds, i.e., 10 sec., 5 sec. and so forth. Do the seconds represent the time it takes for the team mate to appear or is it the length of time they stay in the fight, or both? I've also noticed some team mates will stay till the end of the battle sequence and board the rescue ship with me, then at other times they will leave and not come back at all during battle. Both staying and disappearing happens when I watch a vid to boost my team mate. So what does the boosting actually do? Lot of questions here but to know is to help us all win...or at least slow folks like myself...
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