That's possible. Keep in mind he needs at least 17 in the most important class ability score, so if you want to dual-class him to a thief, you'll need a 17 in Dexterity. Likewise, if you want to dual-class him to a mage, you'll need a 17 in Intelligence. Druids and Clerics need 17 in wisdom. Does that give an explanation for your problem?
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