Summary:

    Base 64 encoded gzip, 
    Expanded gives a set of directions (Left Down Right Up)
    Drawn gives 5138
    Flipped upside down gives 2138
    2=B 1=A 3=C 8=H, BACH
    Answer: johann sebastian

That's so contrived, and they got it so quickly. And they got #40 even quicker.

In hindsight it’s not that crazy compared to some of the Args we’ve seen them do. Gripped b64 sounds like it’s been used before even

That reminds me of a story about an infamous image from an old ARG.

http://www.unfiction.com/compendium/2002/11/15/wheregif/