I completely understand the smoke_and_mirrors dance producers have to perform to bring all sides to the middle, but when it comes to key talent attachments, if it's not verifiable, it doesn't exist. Bottom line, ditch the letters and let us pick up the phone and verify Mr. Jackman.
Of course all of these items are important, and these are the details you should be thinking about before you make the Offer to Purchase. Why? More than likely you and the seller will not agree on everything. That is to be expected, so many of the items above, as well as other items, will need to be discussed and worked out. So what should you do?