Issue converting SUMPRODUCT formula to INDEX+MATCH - excel

Question

I have a spreadsheet that shows the actual dollars produced and the expected dollars produced for each employee, where each row is one day and each employee has two columns. I would like to count the number of times an employee came within 10% of their production goal without referencing specific columns. Please look at the example spreadsheet.
I want for the formulas in cells Sheet2!E4:E7 to do what the formulas in Sheet2!E10:E13 do.
I am trying to avoid using direct column references because it causes me to have to go in and update the columns in the formulas every time a new employee is added to the sheet.
I'm no stranger to using INDEX+MATCH, or to converting SUMPRODUCT formulas to INDEX+MATCH. What I can't get past are the formulas in cells Sheet2!E4:E7. If you evaluate the formula you can watch the INDEX+MATCH section on the left side of the formula work correctly, and then a nearly identical INDEX+MATCH section on the right side evaluate to 0 for no apparent reason.
The formula I'm having trouble with is in cell Sheet2!E4:
COUNTIF(INDEX(Sheet1!$A$2:$AZ$314,,MATCH($B4,Sheet1!$A$1:$AZ$1,0)),">"&(INDEX(Sheet1!$A$2:$AZ$314,,MATCH($B4,Sheet1!$A$1:$AZ$1,0)+1)))
The section to the left of the ">" will match with the correct range (Sheet1!B2:B314), however the section to the right of the ">" will evaluate to 0 instead of Sheet1!C2:C314.
This is strange to me because the only real difference between the two sections is the '+1' on the end of the MATCH function, and adding the '+1' to the section to the left of the ">" produces the expected result for the MATCH function (Sheet1!C2:C314) as seen by evaluating the formula in cell Sheet2!E5.
The formula that produces the correct result is in cell Sheet2!E10:
SUMPRODUCT(--(ISNUMBER(Sheet1!$B$2:$B$313)),--(Sheet1!$B$2:$B$313<Sheet1!$C$2:$C$313),--(Sheet1!$B$2:$B$313>=Sheet1!$C$2:$C$313*0.9))
I understand that if I exclude the '$' before the column references, any future additions/subtractions to the columns on Sheet1 will adjust the references accordingly. This solution is not ideal, because there are multiple data sheets (one for each year) where the columns are all different (Dan is column F for 2019, G for 2018, M for 2017, etc.), and the tables using these sheets are laid out in a way that would prevent me from easily being able to auto-update the formulas, so a solution that locates the correct column using the employee's name is preferred.
The correct result should be 2 for Allen and 3 for Torres, but I can only seem to get the INDEX+MATCH formulas to return 0, 12, 15, 16, or 17 (depending on what tweaks I make to the formula).
Any help with this would be greatly appreciated.

Answer 1

You can try this: ARRAY FORMULA CTRL + SHIFT + ENTER
=SUM(IF(ISNUMBER(INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0))),INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0))<INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)+1):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0)+1)*(INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0))>=INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)+1):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0)+1)*0.9))*1)
and adapt the ranges to your needs. It is entered on the same sheet as the data.
Basically this approach uses ARRAY FORMULA CTRL + SHIFT + ENTER
INDEX($A$1:$E$30,2,MATCH(G9,$A$1:$E$1,0)):INDEX($A$1:$E$30,30,MATCH(G9,$A$1:$E$1,0)))
to get the needed ranges. MATCH looks for the right column. the row number can be set as needed, here its is from 2 to30 adapted to your provided data. My search term in this case is in G9 with Allen as content. The result of the formula is $B$2:$B$30. A +1 after Match gives the other range $C$2:$C$30. Both ranges can then be evaluated with the needed conditions
Pull it down and provide Torres in G10. Then the ranges will be adapted to $D$2:$D$30 and $E$2:$E$30.