It will take more than a limp wave of support from FCC Chairman Ajit Pai to convince the Department of Justice to approve the $26.5 billion merger between T-Mobile and Sprint, despite the two telcos offering a number of concessions. A source speaking to Bloomberg this week claims DoJ top dogs are in favor of blocking the deal due to anti-competitive implications. As pointed out in the report, the FCC and DoJ have never before locked horns by coming to contrasting conclusions with regard to a merger. It’s therefore probably about time and there would be something poetic about it happening under Pai’s reign. It means the coming months could signal a war of words between Pai and DoJ Chief…