It's been reported a lot, he wanted 8, but the AAV was going to be higher so they took 5 to fit in everyone
The deal to sign Auston Matthews to an $11.634 million annual contract includes a full no-move clause in the final year of the contract.
www.forbes.com
"Negotiations with Matthews began last July and over time meetings were held in Los Angeles and Toronto. The issue of team captaincy never came up. Matthews began seeking an eight-year contract. Talks would often go quiet. A couple of weeks ago a six-hour meeting in Toronto appeared to be the breakthrough in getting the deal done."
is the quote from this article, but lots of people reported it other than here and it has been discussed a lot because there is this false narrative he took 5 so he could leave.