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While Brandon Marshall may be a very talented football player, he still has maturity issues that were evident in Denver under coach Josh McDaniels.
In 2009, Marshall was suspended by the Denver Broncos for conduct detrimental to the team.
Coach Josh McDaniels said that it wasn't just one issue that led to the suspension, but a series of incidents in practice that led to the decision.
At the time, Marshall was upset with contract talks and was asking for a trade out of Denver. Some of his antics in practice were brought to light by ESPN:
Marshall went out during pre-practice warm-ups and walked while the rest of the team ran. He punted a ball away instead of handing it to a ball boy, and swatted a pass thrown to him. His actions were caught on video and broadcast by KMGH-TV.
Marshall's antics came after McDaniels and the coaching staff issued a warning to Marshall to clean up his act, but it apparently fell upon deaf ears.
Not exactly what you are looking for out a No. 1 wide receiver.
Bears fans could grow tired of Marshall's unpredictable attitude after the "honeymoon" period is over.