Even without the injury problems I believe the Devils are more likely to draft Hischier than Patrick. After looking at every available footage of the two players, Patrick for me kinda resembles "the old NHL" whereas Hischier is the textbook "modern" lightning fast NHL player. The Devils need to become faster and Hischier is the perfect fit for this. Hischier and Hall would be just perfect together. You can always add Palmieri to the line to add some toughness, but as for speed and skill that would be just so tremendous.
As for Patricks injuries, I don't think you can seriously consider drafting him at No 1 when the differences between him and Hischier in terms of what they both bring to the table are so small. Think about it: Everybody will say "I told you so" if Patrick misses his first large chunk of games, which is surely going to happen sooner rather than later. Shero is not gonna risk that, he is too smart for this. And like I said, it's not as if we're talking a Connor McDavid vs Lawson Crouse difference here.