United will want flexibility on installments and addons, and, unsurprisingly, the price. They'll be pushing for a lower price, failing that, a lump sum with installments and add ons.
Dortmund are firm in their stance that they want €120m guaranteed, no addons, regardless of how easily achieved. In turn, United probably know that they want to sell, they might not need too, and will publicly deny wanting to sell, but they'd like too in order to get some revenue in to minimise the loss. United will try all tactics to lower the price- walking away, looking at alternatives etc. Theyre hoping that Dortmund will cave and lower their price or take Uniteds demands of lump/installments/addons.
Its a poker game, who will blink first. Its hard for Sancho, if he kicks up a fuss, acts like a fecktard and makes life difficult, and the move fails to materialise, hes stuck at Dortmund for another season with fans who likely will be majorly annoyed with him and team mates who think he's an arse.
Chances are if he kicked up a fuss, he'd get his move but that thought must be there that he won't? I can see this dragging on till the final few days of the window, where either Dortmund will cave (unlikely) or United will (more likely). The list of alternatives is getting smaller now, so Woody is running out of options.