First, you're trying to join a squad of Guardian Jetbikes to a squad of Warlock Jetbikes. This is illegal, as neither of those squads has the Independent Character special rule.
Second, you're trying to join your Jetbike Farseer to both the Warlock Jetbikes and the Guardian Jetbikes at the same time. This is illegal, as the Independent Character special rule says that you may only be joined to one squad at a time.
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