Adding more than one of the same fighter to a team will delay each fighter's voice line, causing all of them to play at once. This does not happen with the announcer's line. When it does happen, the voice lines stack, resulting in the line being played once at a much higher volume. While I only tested up to five, I do not expect something unique to happen without a significantly larger number. I was unable to attach video of the bug, but it is not very hard to reproduce. All testing was done on BlueStacks version 18.104.22.1686 running on Windows 10.