More random Question About Absorbing Man

So, saw a clip about [[absorbing man]] and stationing [[wurmwall sweeper]] . The way the explained it was put the charge counters on it and that turn it base power from 4/4 to 2/2 for the example. But what if he already has four charge counters on him. Would he still be a 2/2 flyer or would he get his 4/4? Would it be like a [[mystic decree]] situation. That being everything on the board lost fly, but one enter after can still fly.