Proper communication on both sides the acquirer and the target can resolve such issues. Communication absorbs many of the resistance and aggressive move expected from some employees and/or executives. Eventually, employees need to have a reason for either staying or leaving. Poor communication may lead high performers to leave. Extra work will be there; however, effective merger plans organize and facilitate the processes and give the confidence that “it can be done”.
Inorganic growth might be tougher due to increase of differences between business models of target companies, but proper plans can help.