If you look at the schedule, including the next update, it is expected that there will be four events with Dylan and only one with Sam, also as stated by L&P in that update: "Sophia will rather cool things down with Sam because it's a dangerous game and she doesn't want it to ruin her marriage with that." He also said that Sam will be one of the last to fuck Sophia. Four events vs one is a big difference, so Dylan will progress more, assuming the schedule goes as planned, but at this rate we'll only know that in 20 years
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The developer said he would not make two MCs and focus only on Sophia, but he officially credited Dylan as the second MC.
And when version 0.190 ends, there will be no Sofia events for the next two update periods.
Maybe players can't even see Sophia's face.
And like you said, Sam's events over the next week will be very few and will focus on cello performances.
Also, if Dylan goes to the dorms or if Sofia finds out that Dylan stole Sophia's money, the storyline between Dylan and Sophia is likely to be significantly separated.
Looking at this flow, I don't think Dylan's and Sam's speeds will differ much.
Additionally: I'm speculating that Saturday could be a turning point in Dylan and Sophia's storyline, and that Dylan's schedule with Sundays and Mondays free would function like Sam's cooldown period.