Ohhhhhh I thought you mean't it was a new scene added to every route. Patricia is my favourite choice but having a hard time deciding whether to keep the side with Tarish or rescue Delane for year 2 etc. It's one of the more annoying choices in the game imo as giving Delane to Tarish helps her but also removing Delane helps Tarish, Delane basically has zero influence on whether Tarish wins or not I don't even understand why it's so important that she must be raped at all costs. I'm not sure if you can but the best turn of events would be ignore Tarish (without making a deal) and rescue Delane if that were possible.
It's my understanding that it's because of
how Tarish takes control in both scenarios; with Delane, she can use her to bribe some of the most influential lieutenants under Batri and Ulcro (who had already wanted her before) to come to her side after her rivals are dead. By consolidating power under her own terms, she's a proper chief - albeit not one who really came to power in an Orcish manner, and who still needs the Twins to help shore up her position. Plus, this show of unity gets her the entire tribe, without anyone splintering off.
Without Delane... She's just leader by default. She had a faction, a smaller one, before everyone above her conveniently died - but she doesn't
actually command the majority. It's just that nobody had time to settle who "should" inherit the other two factions before she declared herself in charge, and signed up with the Twins. Under this scenario, she has to deal with active rivals who she was unable to placate - and of the half that left the tribe entirely, it likely included a fair portion of the most ambitious and talented orcs. Her position here isn't anywhere near so secure.
It's not something that we see the direct impact of, because we have no need to spend our time hanging around the orc camp after the Delane issue is settled - but the differences should have a dire impact on Tarish's legitimacy.