Is it possible the Whistleblower DID have first hand knowledge

of all the things outlined in the complaint? I just read it, and too many paragraphs start with, "multiple White House officials informed me".

Before being attacked any more, let me preface my argument by saying I am a Trump supporter. Trump himself doesn't think this person was fed this info. I think the WB is lying and possibly trying to conceal his identity by claiming to have been informed. This person has obviously coordinated with Schiff or someone.

This report reads like an entire case laid out against Trump and Rudy. Dates, times, over several months where half a dozen officials came to this person at various times to "inform" him or her what's going on. It's not just this phone call happened, it's a whole case trying to convince the reader that Trump sought election interference.
Are we supposed to believe that these officials can't keep their mouths shut ever? Really?

It seems more likely that this person actually DID have first hand knowledge of these events, but in an effort to conceal their identity, they put the blame on officials telling him/her these things.
The problem? Whistleblowers are supposed to have first hand knowledge of wrong doings. Which forces the change of that whistleblower requirement just days ago.

Here's the complaint. LINK

Also, here is Trump's tweet from yesterday saying he doesn't think this person was fed this info.

Trump Tweet: Sounding more and more like the so-called Whistleblower isn’t a Whistleblower at all. In addition, all second hand information that proved to be so inaccurate that there may not have even been somebody else, a leaker or spy, feeding it to him or her? A partisan operative?