Let's break this down shall we. He catches it with his hands, allowing for weapon to shave chakra ( from the hands, but anyways ). To push sage chakra naruto has to be completely still and it takes time for transferring and upcoming stoning to happen. Also, giving the kind of positioning involved, there is gonna to be a struggle of 'moving the sword' and 'holding it in place'. This struggle moving naruto around meaning no sage chakra being gathered. Also, this is also assuming that Naruto doesn't just get 'falcon-kicked' or other such things. If naruto takes the kick ( also applies to other such things, but let's stick with the kick for simplicity ), then he better not be moved AT ALL because of it. Otherwise, no sage chakra. If naruto doesn't take the kick and infact dodges/counters/etc., then he is moving. Meaning no sage chakra.
So basically, both points stand.
-edit-
Of course, this is all with the intention that Naruto can't gather sage chakra correctly while moving. At some point, he may be able to in the future.