RE: the defense, remember this is a new scheme. Players never play fast when a new scheme is installed. Without seeing how it's being played you can't really pass judgments. Staley's zone was drop, read, and cover (man). It appeared in that first game that Morris tried to play it that way, but his second and third-string CBs are slow so they got burned when the receiver carried it deep.
This scrimmage sounded like cover 1 which would seem to me Morris wanting to see how his starters look as a coverage option. The last time the Rams played a cover 1 was probably under Phillips and he didn't use it as much as he would normally do because of Peters and NRC constantly going rogue and dropping coverage and his #2 was Hill who is strictly a zone coverage CB, i.e. drop, read, react. This is the time coaches experiment. It sounds like Morris had Ramsey dropping into Star and Long covering on the boundary. Long really isn't a SCB. That is why I think Morris wanted Hall who is a SCB. With Rochell on the rise, it gives Morris another option. He could drop Williams into the Star and play Long or Rochell outside.
Regardless I'm not overly concerned because coverage combinations are being tried out. Morris is praising Long's practices and work ethic. Burgess has made some mistakes in coverages but that is to be expected. Burgess is a second year player but because of Covid last year and his injury, Terrell is behind where a second year guy would normally be.