I mean, it's good, but it feels like an over reaction. They don't need to make an entirely new character, they just need to think of a reason they'd cooperate. It can be a contrived reason, that's fine, but they need to work together. Some examples,

1. Highly shy character "warms up" to at least one other character and sort of talks to the group "through" that character, but you can still (as a player) face the whole table to talk as a group.
2. Character who is extremely distrusting has met a character before (just tweak backstory) or finds at least one other character implicitly trust worthy. Maybe the Rogue who has been backstabbed too many times trusts the Paladin because they know they're too honest to lie.

Edit: It can also be like "my god told me" or "I just know y'all are a good bunch" lol. Doesn't need to be elaborate.