Weghorst might actually be a shrewd signing. He's pretty much 1 in 2 at all his previous clubs since 2016, with the exception of Burnley, and as a result most people don't really rate him. Burnley were pretty rubbish though while he was there.
He's very much a different profile of player to what we have, a physical yet mobile striker who presses very well and can link play. It could just be that he knits things together quite nicely, Martial hasn't been great lately and will no doubt be injured again soon. I'm also not sure I'd even call Martial a proper striker, so we don't even have one at present.
Ultimately it's a minimal risk, and the club have effectively got a transfer embargo in place now due to the hopefully impending sale - so options are very limited.