Using a DDJ-400 and two turntables as inputs into DJM-750mk2.

So I am looking at going 4 channel and I currently have a DJM-250mk2 plugged in to two vinyl turntables. I also have a DDJ-400 as a mobile mixing unit, but this as we know does also operate as inputs when plugged into a laptop with the DJM250mk2. So my options for 4 channels are buying a DDJ1000 and plugging the turntables in. This would give me 4 inputs (2 built in jogwheels and the external decks), but I understand the audio quality from a DJM-750mk2 will be superior for analogue signals. So a DJM-750mk2 with four inputs is the superior route (is this a correct assumption?) So if I was to plug a DJM-750mk2 in with the DDJ400 (with the decks plugged into the back) would the DJM-750mk2 recognise the two jogwheels on the controller and the 2 external inputs giving me 4 mixable inputs at the same time?