N&W-NKP-WAB Merger Questions - Trains Magazine

Can someone explain exactly how this merger happened?  I've tried Googling this stuff, but even Wiki doesn't give me an exact account.  I've seen that the PRR transfered it's lease of the Wabash to the N&W in 1960, and thus the Nickel Plate had to ask for inclusion in the merger.  I've also seen that the N&W and NKP started talking about merger after PRR and NYC did, and then the Wabash had to ask for inclusion because it had nowhere to go.  Which way did it happen?

The Pennsy gained N&W stock when it gave the Wabash lease to the N&W.  When did they have to give up this stock?  In 1968 when the merged with NYC, 1970 when they went bankrupt, or 1976 when CR was created?  Again, I've seen different reports on this.

I've also heard that the DT&I controlled the Wabash for a period of time?  When was this?  Was the PRR's lease of the Wabash held by the DT&I, whom itself was controlled by the PRR?  In 1963, the DT&I acquired control of the Ann Arbor from the Wabash.  Was this so that PRR could retain control of AA after WAB went to N&W?

Finally, why did the AC&Y fold into the N&W?  They were a small line, and I don't see the importance to N&W.  Did they create some special connection that I can't see on a map?  Seems as though they could have remained a shortline on their own.

Thanks ahead of time for the help!  I've seen different accounts on what actually happened - and I'd just like to know the REAL history from a knowledgable source...as apparently not all internet sites can be correct.