Concatenating INDEX/MATCH with multiple criteria and multiple matches - excel

Question

I am using Excel to track a team game where players are divided into teams and subteams within teams. Each player within a subteam scores a certain number of points, and I would like to have a summary string for each player with the number of points other players in the same subteam scored.
Example:
A B C D
PLAYER TEAM SUBTEAM POINTS
Alice Red 1 70
Bob Red 1 20
Charlie Red 1 10
Dave Red 2 70
Erin Red 2 30
Frank Blue 1 55
Grace Blue 1 45
My desired output looks like this:
A B C D E
PLAYER TEAM SUBTEAM POINTS SUMMARY
Alice Red 1 70 Bob:20, Charlie:10
Bob Red 1 20 Alice:70, Charlie:10
Charlie Red 1 10 Alice:70, Bob:20
Dave Red 2 70 Erin:30
Erin Red 2 30 Dave:70
Frank Blue 1 55 Grace:45
Grace Blue 1 45 Frank:55
The furthest I was able to go is a combination of CONCATENATE, INDEX, and MATCH in an array formula:
{=CONCATENATE(INDEX($A$2:$A$8,MATCH(1,(C2=$C$2:$C$8)*(B2=$B$2:$B$8),0)), ":", INDEX($D$2:$D$8,MATCH(1,(C2=$C$2:$C$8)*(B2=$B$2:$B$8),0)))}
This unfortunately just outputs a summary for the first player in the subteam:
A B C D E
PLAYER TEAM SUBTEAM POINTS SUMMARY
Alice Red 1 70 Alice:70
Bob Red 1 20 Alice:70
Charlie Red 1 10 Alice:70
Dave Red 2 70 Dave:70
Erin Red 2 30 Dave:70
Frank Blue 1 55 Grace:45
Grace Blue 1 45 Grace:45
What I need to do now is:
Excluding the player for the summary (I don't want Alice in the summary for Alice, but only Bob and Charlie)
Getting it to work for multiple matches (there can be an arbitrary number of players in each subteam)
Getting CONCATENATE to work with an unknown number of strings (because as said above, there can be an arbitrary number of players in each subteam).
Ideas appreciated!

Answer 1

I put together a helper column that concatenates each player/points and the TEXTJOINIFS from TEXTJOIN for xl2010/xl2013 with criteria for the desired results.

Answer 2

Unfortunately Excel (prior to Excel 2016) cannot conveniently join text. The best you can do (if you want to avoid VBA) is to use some helper cells and split this "Summary" into separate cells.
See example below. The array formula in cell E4 is dragged to cell J10.
= IFERROR(INDEX($A$4:$D$10,MATCH(SMALL(IF(($B$4:$B$10=$B4)*($C$4:$C$10=$C4)*($A$4:$A$10<>$A4),
ROW($A$4:$A$10)),E$3),ROW($A$4:$A$10),0),MATCH(E$2,$A$1:$D$1,0)),"")
Note this is an array formula, so you must press Ctrl+Shift+Enter instead of just Enter after typing this formula.
Of course, in this example I assume 3 players. Your requirement of arbitrary amount of players cannot be met with formulas alone, but you can just extend the "Summary" section over to the right as far as necessary.
If you really wanted to, you could even concatenate the "Summary" rows to form a single cell, e.g. something like:
= CONCATENATE(E4,": ",F4,", ",...)