The endgame of relentless merger activity, after all, is a few companies in each industry owning their markets and having unfettered opportunity to do and charge whatever they like.

请问：

(1) 修饰语owning their markets与having unfettered opportunity是否均可认为相当于定语从句？若是定语从句的话，那么其先行词是companies还是industry或是a few companies in each industry这个整体呢？

(2) 判断定语从句的先行词是否得用逻辑分析呢？

(3) 主语为the endgame，其补语为a few companies，二者都是名词，则二者应存在全等的关系。从句意上看，the endgame应指形成的某种局面，即指a few companies own their markets and have unfettered opportunity…。从语法上分析，the endgame就是指a few companies，而the endgame与a few companies应该不是全等关系。这个句子是标准、正确的句子吗？