Although if he gives up shusui, it would open up a spot for one of the 12 greatest swords (like shodai kitetsu). Well it might still be a bit early for that so maybe he’ll get nidai kitestu first so he’ll have 3 swords of the 2nd strongest level (21 o wazomono). Usopp has done a similar thing in Water Seven, and without consequences… so I think that Zoro was really talking about getting lost. When he felt from the justice tower, he was pretty much in a bad shape.