For the first question, it's kind of recommended that you do so that you can try to see how the AI moves your team. It also helps you see what units have good synergy with each other.
For your second question, the answer is yes. You can only have one of each seal, so if the unit isn't using it, then it won't be shown when other players find your defense team. As for the skills, they're still on the same unit that you're using for arena defense, so they'll still be there.
TL;DR, your arena defense units will still stay on your team no matter what you do unless you unequip them from the team. As for playing a map w/ your team, it does and doesn't help. Anyone can manipulate the AI, and it always loves using assist skills.
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