So, even though google supposedly can crawl ajax, there are always troubles with it. Check this article: http://searchengineland.com/can-now-trust-google-crawl-ajax-sites-235267
And here is a thing about diluting. If Google can indeed crawl ajax, it will be the same in terms of dilution, since it would be able to see all the links. Here is another question - are all those links follow?

