Do we have the risk of loosing credit for untrusted links if it is gained for a new site before receiving trusted links?

Yes, this is a major risk factor. Sometimes it happens that most of the links are traded for a new site or are bought. A site owner would have possibly read in forums that reciprocal link building or buying links are the best ways to build links. Then he realizes that his site is not ranking. A site owner finally decides that he needs quality links he goes for branding and writes great articles, brings interesting stuff to the site which starts attracting high quality natural links. His site starts steadily improving and this time the site owner has the risk of loosing credit for the reciprocal links / bought links which was there before his site started acquiring trusted links. We have seen this happening with Google. So we recommend to site owners / SEO companies that they don't use link building methods for new sites which brings in not–trustworthy links. For a new site think of natural ways to build links. Imagine how great sites grew to this level. Not all sites started with 10,000 links to them. Successful sites take time to build their brand that is how search engines want new sites to be. Think of ways to bring in great links once your site is good enough and use all ethical link building strategies in books.