I think Klopp really sees something, or his trusted advisers see something, in Karius that they believe will make him a top keeper.
Looking at the timing of this, it seems obvious that he's held off putting him into the glare of the spotlight after his unconvincing start until VVD has come in.
The rest of this season is gonna be Karius in goal, & tbh if the only alternative is Mignolet then it makes no difference to me.
They're both shit currently. The only reason I & everyone assume Mignolet is better is cos we've seen some good things in the 200 plus appearances he's made with no chance of being dropped until this season.
Karius has made what, 15 or so appearances, almost all of them being dropped in & out of the side.
It's not a far judgement to deem them both shite, as Karius hasn't had a fair chance yet imo.
As I said in a thread yesterday, ideally I'd like us to buy a top keeper & send karius on loan to another premiership club to play every week for a season, but AFAIK there are no top keepers available now, so Karius being given a fair shake doesn't make any odds over Mignolet playing, & at least we'll have more of an idea.
Let's look at it this way, if Karius does find his form & start looking like the real deal we'll save a shitload of cash, if he doesn't, then we'll be stronger in defence thanks to. VVD anyway, & it's not like Mignolet is saving us points every match.