Well, I often do that when I need just a little bit of damage to finish off the round, or when I just want to land some extra damage.
It doesn't depend on the starter at all, but there are a lot of ways to launch your opponent a second time, the easiest one is by doing Silent Force in the 2nd or 3d hit of JH (It depends on the height the opponent is and weight of the character) and then going with 5K > JK > BnB or 5K > cS > JK > BnB. The second one is what you say you see Nakamura doing often, it's kind of hard to explain, but depending on the height of your opponent while you're doing your combo you can pick them up again easily with 5K/cS. You can try going with 2H > JS > JD > IAD JK > JP > JH > Land 5K > cS > jK > jD > IAD > jP > jH against Elphelt/I-No so that you can get the feeling of what I'm talking about. (If you want even more damage or just fancyness, try doing this at the end of the combo: jH (2 hits) > Silent Force > Winger)
The thing here, is that you need to add a couple of hits into your combo in order to relaunch without Silent Force, the basic BnB goes like Launch > jS > jD > IAD jS > jH, if you want to pick them up with 5K for example so that you can keep the combo going, you need to add either a jK between the Launch and the jS or going with IAD jK > jP > jH instead of IAD jS > jH.
Once you get the hang of what I'm talking about, you'll just need to delay your hits without adding extra buttons to relaunch your opponent, anyways, try doing the combo I wrote above against Elph/I-No (I could get certain parts wrong, since I just go with whatever I feel I need to hit/delay if I want to do a relaunch combo) and see if that's what you're talking about.