Unless it's the Tooth Fairy, a "finance only" partner will uudoubtably want something in return. If the "something" is interest, it's called a loan (like GE). If the "something" is a piece of the pie, it's called a partnership (like Leo and LFB). If the "something" is stock to play with, it's called a placement (like take your pick).
(I would think "silent partner" has no place in a public company.)
What other possibilities are there? Well, there is a buyout either by another public company or a private entitity to take it all private.
Or there is a merger vis-a-vis Genzyme and BioSurface Technology.
My vote goes to the merger ... Genzyme, Pharming, Pharmathene, whoever. However, if it was my decision to make I would try for the RS instead ... to reload for more financings/dilutions until some milestones are met.
Disclosure: I am not presently a stockholder so I can be a little more objective, but I may become a stockholder again ... depending on how this all plays out. My concern at this point is that Genzyme will play Pacman and leave stockholders wondering what hit them.