@Gray Lightning, while I know Iris is Barry’s wife and I have absolutely no idea why they would part, I just don’t think she would be that helpful. Sure on most of his missions, she’s behind the desk giving him info, but really she’s not that good of a fighter. Ralph would be useful on one of those spy and get out of trouble quick situations but honestly, he doesn’t take things seriously and thinks he’s invincible because he has bulletproof skin/ or that bullets LITERALLY bounce off him. Cisco and etc., would be useful to see if anyone time traveled, breached from another earth, and can shoot blasts of energy from his hands but, is vulnerable against people who fight better than him, speedsters, and physically stronger opponents. Which is why if he was on Barry’s team, out in the field, constantly, he would most likely last a few weeks. Caitlin/ Killer Frost is interesting because she’s frozen speedsters like Zoom, blasted Savitar away with an ice blast, froze Cisco’s hands cold enough to shatter, make her hand into a long hand sword, is immune to Meta Human stealing equipment or people, can create transportation(Frozone), and is a good friend by nature. She’s that kind of person who listens to people and at the end of the day, a person we can relate to. But she just doesn’t seem right for Barry. If you chose a speedster, doesn’t matter who, together the enemy wouldn’t stand a chance. Besides all of the speedsters we’ve seen so far has proven talented, skillful, and smart in extraordinary situations. So, that’s why I choose speedsters.