Molehill
International Coach
I would broadly agree with this. Only thing I'd mention is that if Inglis was in the starting 11 and Webster the sub, he could only be a replacement for him if he didn't bowl.IMO there should be injury replacements in Tests. A bowler going down early in the first innings is a big disadvantage for any team for something that can be completely out of any teams control.
I'd potentially only offer injury replacements for different halves of a game. E.G. if a player goes down in the first or second innings they can't be replaced until the third innings so you can't end up with 12 batsmen in one innings or an extra bowler. Injuries would still hinder a team but not as much at least. If someone gets injured in the third or fourth innings then no replacement available. This also potentially allows for some time for someone to be flown in for local teams if possible.
As for who authorizes injury replacements I think just have the captains of both teams being able to OK it. Could add the umpires to the list as well. There would be incentive for captains to work together for it since players could go down on both teams.
Before each game teams would need to name their replacements ahead of time and it can't be changed unless they are needed. (E.G. below for Aus from the recent WI series).
Marnus - Replacement for Batters 1 - 5
Inglis - Replacement for Webster, Carey
Boland - Replacement for Starc, Hazlewood, Cummins
Kuhnemann - Replacement for Lyon
If a replacement is used then another like for like player will need to be named at the time. Replacements also need to be like for like so no Kuhnemann for a batsmen or pace bowler to potentially take advantage of changing conditions.
During Eng v Ind we've seen a bloke with a broken foot (who was basically walking around in a protective boot and crutches) coming into bat, then we've seen a guy with his arm in a sling do likewise. The concussion rules were changed so that these passionate team players didn't put themselves at more risk, I fail to see why other injuries should be exempt.