none of that matters. The reason people are comparing him to Allen is how he plays the top of his route. Not his 40 time, weight or height. Loveland breaks well, and can get open on those option routes (inside/outside) that Allen was known for. He provides the same FUNCTION.
As for giving Johnson some benefit of the doubt on the pick, I totally agree. We all loved what Johnson did in Detroit, and a lot of that was about how he used Sam LaPorta. Now we have a guy who's NFL comp is LaPorta, so we should let it play out before we judge it. It seems a pretty natural pick.