Does that suggest that William and his buddy work for Delos during the period they're at the park (the other guy whose name escapes me mentions the financial trouble and that their company is considering a buyout)? That opens up two potentially interesting avenues for me:
a) The older version of Williams friend could turn up as a senior Delos employee or board member.
b) The foundation comment made by a guest earlier in the series is actually a red herring, mib is in fact William but his slide from the generally moral character we see during the earlier timeline is triggered by something that happened on his first trip to the park. Following this he becomes much harder, stays with Delos and becomes CEO eventually (the foundation could have been set up by Delos as opposed to individually, and could as others have mentioned been linked to the science used at the park, potentially the use of printed organs, or something along those lines). That certainly opens up some interesting avenues.