Last year we saw a surge in big M&A deals, and if the financial markets hold we’re likely to see even more $10 billion+ deals. But unlike 2014, when acquirers outperformed non-acquiring companies by 5.9 percentage points, there could be a lot more underperforming copycat deals from companies that are just trying not to get left behind. “Market confidence is riding high, even for the complicated larger mergers, but with the more apparent inorganic growth opportunities already taken, we may see some failures making headlines in the near future with the latecomers falling off the crest of the merger-wave,” writes…