Or, if you mean that McCoy should be unchallenged in his dominance of saltiness…
In either case, as with Kirk, there was and is no reason to rush any of their introductions for at least a couple of seasons. While some legacy characters draws seem to be something dictated from Paramount above, they are crowding out the development of the original characters in the show.
Adding Uhura to a crew that already had young Spock was already a heavy legacy character load. Fridging a great character and performance to advance her growth is a lazy writer’s shortcut, and doing it with the first main cast person a disability is unworthy of Trek values.
I really hope they cast Bruce Horak in another role if we’re not going to see Hemmer brought back to life.