Arnold didn't start playing in the nfl 3 games ago and yes he had multiple conversions in those 3 games, some at crucial points. Tremble did just start playing in the NFL 3 games ago and Tremble wasn't drop free in college.
Arnold's hands were more proven than Tremble, or Ian Thomas. If Arnold was on our roster last year he would have been 2nd in touchdowns. He was the Cardinals 3rd leading receiver in 2020 with more yards than Larry Fitzgerald.
I love Tremble and think he'll do fine and he will probably surpass Arnold.