What lead?
Apple was following others with multi touch.
Microsoft had fully function Surface prototypes back in 2005.
That project was started back in 2001... long before the idea of using multi touch was an itch in Steve's pants.
Apple put together a nice package using existing technology.
They deserve the credit for the work they did, but make no mistake, they are riding on the R&D of others.
Since you do not have access to the R&D documentation or the patent wrappers of either company, your statements as to who had what, when, are bogus. Demonstrating semi-functional prototypes means nothing, although it could limit your time to file your patent application.