To be fair, Jack can only go off of the past fights. After this fight I bet his analysis changes. Aldo has clearly been working it with how accurate he is landing it.
The thing is that the past fights I've watch from Aldo shows that he's always had a GREAT jab. He always keeps his right hand up right at his ear and he leans into it and makes it reeeeal long. He looks like a fencer when he uses it. He chooses to use it to keep opponents at bay and as a means to stop their momentum. Not as a combination tool as Jack seems to want to see.