DA already thought of blowing the team up in the '11 summer, per R. Allen

[kozlodoev]

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Also, furthermore IIRC, the Celts had decided to sign Jason Terry BEFORE Ray signed with Miami.
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Days before Ray agreed to go to Miami, he had stopped returning phone calls to Doc. This is Doc's account of what happened. It’s not clear, from the facts I recall, that the Celtics would have agreed to acquire Terry and used up their mid-level exception, had they been confident Ray wanted to stay.

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SLAM: Throughout the time you’re making this decision, are you getting calls from your teammates? Did you get calls from your old teammates on the Celtics?

RA: No. Nobody. I didn’t get a call. Nobody called me. When we made the decision, it was me circling the wagons and everybody was doing their thing, going in their directions and it was just us sitting here. It was about what we had to do to keep my family happy and together.

KG was becoming a restricted free agent at the same time, and was in the process of deciding whether or not he wanted to retire. He wasn't going to be calling up Ray and encouraging him to stay, before he had decided to stay himself.

Garnett resigned by the end of June. Allen didn't leave until July 10. So Allen was clearly aware Garnett was staying, and there was plenty of time for phone calls, too.