We know that Lord Krsna was always focussed on helping the Pandavas throughout their lives. Therefore, in the Mahabharata, we see him making frequent trips to Indraprastha, Hastinapura, Kamyaka and Dvaita Vanas and Upaplavya to help the Pandavas. We also get the idea that Krsna is away on all these visits, as one can see what Krsna says about Shishupala's attack of Dvaraka when he is away, as also of his sudden arrival back to Dvaraka upon Shalva's attack of Dvaraka.
But in the 69th Chapter of the Dasama Skandha of Srimad Bhagavatam, we see that Krsna is present in all 16108 palaces of his wives, as well as handling affairs of his kingdom by being present in more than 16108 places at once.
If that is the case, then it is logical to assume that only one among the thousands of Krsnas went to Hastinapura and Pragjyotisha and so on. But this contradicts Krsna's own statements made in the Rajasuya Yajna, that Shishupala misused the situations where Krsna was away from Dvaraka.
So, did all the Krsnas leave Dvaraka on these frequent travels, or did only one Krsna make these trips?