What did he achieve by playing Henderson when De Gea was fit, in correlation to what was happening at the likes of City and Liverpool who had developed teams that could build play from the back utilising their Gks in possession to evade the press and break lines to then play a higher defensive line. And once you've achieved that, then the GK is required to sweep up in a higher line.
So when Solskjaer said he wanted to play a high line 'like Jurgen' he should've understood that Klopp's CBs, fullbacks along with Allison as the +1 in possession were far superior to anything he had at United to play a high line like Jurgen. Because to play like Jurgen, players in the first phase of the build up are required to be comfortable on the ball against the opponent's press. Solskjaer went on to sign Wan Bissaka and Maguire for around £150m and followed that up by adding Bruno to a midfield that contained Pogba and then compounded things further by pushing for the Ronaldo signing where it was reported about Solskjaer ignoring the advice of his coaching staff to sign Ronaldo who he felt would make up for his deficiencies out of possession by scoring goals. To play a high line like Jurgen one must first have the vision to know what the purpose is of playing in a high line. And then one must have the coaching capability to instil the vision into the players on the training ground as well as recruit players who fit the vision/play style.
Also this is the Andre Onana thread, so if you want to discuss Solskjaer further then please tag me in a thread discussing Solskjaer.