The difference is that the first route is the main route and the important one.
If you are worried to get only 33% of Rion's content with the first route, it's not even true in this update as paths 2 and 3 are just a slight variation and it will be even less true in the rest of the game.
I cannot say more, because that will spoil all that is going to happen after, at v0.9 it will be clearer. Maybe my cliffhanger skills for timing the end of update in the most critical moment were a bit exaggerated this time ^^. I always try to let some confusion at the end of an update, that's normal. Maybe a bit too much this time, I don't know, I believe it's natural to have questions and worries, it means you care, and that's nice
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The romance/lust path is the main route and
yeah they are more or less merged since v0.7, they are the same path but with slight variations on the possible sex scenes (same for Maddie since the start). Where I changed my mind a bit on v0.8 is on giving a cross path from lust to corruption, while at first, I was just going for the evil/corruption route as an alternative. If that was a good decision, I don't know. Some agree some don't. But I cannot let say it's a forced choice