INDEX/MATCH Array within LARGE Function?

I have been searching everywhere for something that might help me with this and I just cant seem to find it! I guess essentially I am trying to do a look up based on a column and then find the largest value from the row to the right of the data. It would look something like this,

Data Sheet
A 10 15 20 30
B 8 16 32 64
C 1 2 3 4
D 2 4 6 8
E 20 40 60 80


Main Sheet
Largest Value
A 30
B 64
C 4
D 8
E 80

The problem is I can make A,B,C,etc. static on my Main Sheet however since I am pulling data into the data sheet there is not always data for A,B,C,D,E which causes them to shift making it where I can just do a standard =Large(B1:B4,1).

I've tried INDEX, MATCH, ROW and some other ideas but cant get anything to work!!!

Any ideas? Thanks!