You're talking about one cameo, and in that Martial on another shite day made an very important impact for the end result. On average counting all performances, cameo of both players, Martial would always come out better because Weghorst not only had bad performance, quite a few of his involvement come at the cost of tactical sacrifice of his teammates and hinder the whole team performance. You're talking as if Martial is bad at linking up play, whereas that is one of his strongest points, and overall he's naturally doing at high level.
Martial is never a pressing machine, but he actually was not as detrimental to the team even on this front. Martial may not need to run at full speed, being in the right position, doing the required pressing run had forced a mistake that created Antony's chance at 8th minute. Unless you really good at dispossessing opposition, pressing is still percentage, just because you look like running like mad man but have no speed, you're no probably better than Martial pressing in this situation. Plenty of Weghorst was just stats padding with majority of them being inefficient.
In Martial goal, he himself moved and dragged the defenders away. Craig Dawson were forced to stay farther to our left because Dawson had to keep check on Martial. Else, Dawson could have rushed to close down Bruno which in turn allowing the other CB to mark Antony tightly. Antony was free because the other CB had to close down Bruno who ran straight at goal. Bruno made the pass to Antony at the moment CB attempted to close him down centrally. Antony could have scored himself with that big of an opening. We can't trust Antony finishing of course. Martial scored when Antony decided to square the ball, didn't negate the off ball run that opening the space Antony!!!
Some people really scrape the bottom of barrel to find thing to raise Weghorst. That's the problem. It only backfires by inviting analysis into Weghorst. It's fine to slate Martial in his own thread for his overall performance, but when you start comparing, you would die on this Weghorst hill, because Weghorst contribution is so puny and he's clearly a worse player overall. Martial meh performance had enough impact to decide this game in our favor. A goal to give us a lead in our situation is plentyful impact.
Weghorst had a positive cameo. Good for him. It changed the game? No. We're winning this game anyways with Martial goal. We defended well enough. We created enough chances for another goal without Weghorst in this game. People made a big deal about one through ball, one lay off for Sancho chance as if it's usual good performance you can expect from Weghorst.
If you thought Weghorst run for Sancho chance is good, then nothing anyone can help you. Weghorst ran at channel near the ball carrier inside the box, which was a poaching run, not a support run. Weghorst himself pointed asking for a pass from Sancho into the space in front of him. Defenders were well in their positions and zone. It's all about Sancho skill for that chance. The correct support run is occupying the CB, or run to the other channel, so that CB was denied a chance to attempt a block.
The run for Garnacho also was not selfless, and making space for other either. It was a run to become available for a through ball. If anything, it just showed how much Bruno distrusts Weghorst. Bruno chose Garnacho who had a marker, over Weghorst who was free because Dawson was occupied by Bruno position himself. Even if Garnacho didn't score, it's no big deal, because it's doubtful Weghorst could have if he's the one to receive the through ball. He's too slow even with the opening. The attempt to ask Garnacho to give him as pass is pathetic. He may be free, but his position is bad, and nobody can trust him to finish from that angle when he messed up easier chances.