Question

Why does the intruder choose Gerrard as the man whose identity he wants to take on?​

Answer 1

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The intruder chose Gerrard as the man whose identity he wants to take on because he is a kind of a mystery man. He phones his orders and sometimes goes away suddenly and come back just the same.

Answer 2

The intruder chooses Gerrard as the man whose identity he wanted to take on because he is of the same build as Gerrard. He is a murderer. As Vincent Charles Gerrard, he will be free to go places and do nothing. He can eat well and sleep without having to be ready to run away at the sight of a cop.