i dont think thee is such a thing as 'too much influence', its about how you interperate said influence and grow as unique. there is, i think, a very thin line between influence and Plagiarism.
perhaps 'Plagiarism' is too strong a word, but you know what i mean.

influence should be used as a growing tool, a point of reference, retrospective or otherwise. you learn from it then make something beautiful all of your own from what you have gained from your 'heroes'.