That second tweet isn't remotely from a reliable source. I agree that Prigozhin probably didn't leave Rostov-on-Don but there's nothing anywhere to say that Utkin was leading the convoy, especially as Utkin was proven a long time ago to be an asset of the GRU, supposedly it is Utkin that gave Wagner PMC it's name, as Wagner was his callsign in the Ru Army, the official narrative being that it was he that founded the PMC. That has never been that credible and Belingcat kind of proven that the whole Wagner PMC thing was basically a GRU front. There were many links between Utkin and GRU handlers, including flights they travelled on together
Bellingcat (Article predates the invasion)
Someone was obviously leading the column, I'm not so sure it was Utkin though given his connections to the GRU