ap1234,
I am not sure the evidence supports it. Sure, the tone in the letters suggest caution re. the stock. However, I expect that comes from a desire (oft-stated too) to keep his current shareholder base mostly intact i.e. the price is at a level that potentially allows for continuing attractive returns.
I can see your case if he'd actually issued stock for acquisitions at some point, but seeing as he hasn't...
FWIW, I do think Mr. Market is not pricing in the risk of a big acquisition running into trouble. Given the lack of historical precedence here with respect to transactions of size, I am not sure this is warranted.
I will pass on price, even if the rest of the pieces look as if they are well in place.
Best,
Ragu