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today I've checked link building progress for a site I am working on. I've noticed lots of new links and new domains, I was happy but a bit surprised because I havent'y done any serious link building yet. investigating more, I've checked the pages that should be linking my site, and these pages are on totally unreleated sites or they doesn't even exist! as an example, my site is about road bicycles, and opensite report this links: www.murrayschicken.com/
murrayschicken.com/alejandro-suaya
murrayschicken.com/weeds-actress
murrayschicken.com/gt-bikes-bump
murrayschicken.com/goldie-gray
murrayschicken.com/anna-elias
murrayschicken.com/brian-joseph-ochab and 14 more as you can see, these pages are down. probably never existed. so what's happen? opensite is getting crazy? www.murrayschicken.com/ has been got hacked? my client is doing some black hat link building? any opinions?

scenario: I have a product page with some text about the product and 12-15 different images af the product: details, colours, different views... how should I name an alt tag them correctly, been them actually really similar? Is it keyword stuffing to use the same name containing a relevant keywords?

I've been taught during a SEO course that the whole site has to contain the chosen keywords with a fixed proportion of optimized pages, that should be like this: 50% of pages optimized on the most relevant keyword (just one keyword) 25% of pages optimized on secondary kewords (depending on the size of the site, could be a few pages for each secondary keywords) 25% of pages on long tail keywords. the teachers was a very respected SEO professional, but I've never seen this strategy anywhere in other articles or SEO guides. what do you think about it?
It's true that it brings visibility for the top keyword?
does it lead to cannibalization?
what others strategy do you use?