Dear Modernist - 
I don't routinely insert material into any page without some attempt to correctly cite it; references can be disputed, not this. What we have here amounts to, "this is my POV on some matter; now kindly locate some references for it, if you please". This won't do. 

If you have some proprietary feeling about the paragraph, or know the contributor, request the citation, if you would. But dumping material like this on the page does not warrant my research support on the basis of "collaboration". 

This also applies to the following uncited edit under "Later Works":

"Devoting his full energies to his work, Picasso became more daring, his works more colorful and expressive, and from 1968 through 1971 he produced a torrent of paintings and hundreds of copperplate etchings. At the time these works were dismissed by most as pornographic fantasies of an impotent old man or the slapdash works of an artist who was past his prime." 

One editor commented on this correctly and called it"

"(1) undignified writing and (2) highly speculative." 19 January 2011 (UTC)Larry Siegel

Another editor defended it saying: "It's clearly from a decent source, though it would be better if that source was cited. But there is no reason to remove it.". Tao2911 (talk)  

How would Tao2911 possibly know if it was a "decent source"? This is all nonsense, Modernist, and you know it. Mysweetoldetc.