I think it's probably fairer to say that Klopp has gotten more out of his signings, rather than simply saying that more of our signings have been a success. There are some like Chamberlain and Shaqiri who probably aren't successes. Then you have Klavan, Karius, Caulker, Tsimikas, Keita, Thiago. Players who haven't worked out as planned. Mostly cheaper signings but not successful ones.
The likes of Salah, Mane, Wijnaldum, Van Dijk, Alisson, Robertson, Matip and Fabinho have all been excellent and performed at incredibly high levels since coming in. Jota has had a good start as well.
Salah hasn't had a good season. I don't care what anyone says about his goal tally. He's been greedy all season.