One of these documents has Jef Raskin claiming credit for the mouse and related UI behaviors.

This, from Andy Hertzfeld, is an important addendum: https://www.folklore.org/I_Invented_Burrell.html

I remember that a rollon deoderant ball was used in the prototype:

https://wtffunfact.com/wtf-fun-fact-13513-apple-mouse-protot.../

I understand that Harvey Dean and David Kelly took the prototype to refine it into what actually shipped.