Amir Johnson destined to be with Celtics

New Boston Celtics forward Amir Johnson, who will be formally introduced Monday alongside the rest of the team's offseason additions, posted a photo on Instagram Thursday that dates his time in green back to about 1997 ...

A photo posted by @iamamirjohnson on

His card suggests Johnson was 5-foot-4 at age 9 -- which is a pretty big 5th-grader (as a second photo he posted confirms).