I didn't update it with newer YFull data, but with the old it's pretty clear that there are two peaks of R-Z280+R-M458 and one separate of I-CTS10936+R-Z280. They are not in sync, these were two different Slavic expansions if the data holds up.
Also note that for I2a-Din it primarily one huge expansion event in a pretty short period of time. That's really exceptional for major European haplogroups, because most others, even if experiencing big expansion events, have multiple ones to reach that level. But this is just one skyrocketting one. It didn't make it bigger than other big players, not at all, but it brought it into the top league of European haplotypes from practically nothing.
Also note that R-Z280 expanded earlier than the others big time too, so there is this scenario in which R-Z280 conquers/assimilates a population which has either one or both of these other main Slavic lineages and they just explode as allies (of R-Z280). Other lineages like e.g. some E-V13 ones seem to have joined roughly about the same time. Could point to the Northern Carpathians and some Celtic, Lusatian or Dacian people.