Your point that Adsense is a skim from Adwords revenue would be completely wrong.
At least from Google's standpoint it appears that Adsense is the revenue stream not Adwords. Looking at the 2013 Annual report Google has a category for "Google Websites", "Google Network Members' Websites", "Total Advertising Revenues", "Other Revenues", "Total Google Segment Revenues", "Total Motorola Mobile Segment Revenues" and "Elimination & Other". There is no listing for "Adwords" or "Third-Party Advertising Networks". All the advertising revenue appears to stem from Google's own websites and the "Network Members' Websites".
This makes accounting sense because no money accrues from an Adword ad until there are clicks or views.
And your contention that you cannot compare apples and oranges is also wrong.You can if you are doing something like comparing out how much one increased over how much the other decreased or how much money an apple orchard makes versus an orange grove.
You just make all these objections up out of thin air, don't you? Admit it.
If you look at that 2013 Annual Report you can detect some serious problems in the Adsense ("Network Members' Websites") revenue stream. Q1, Q2 and Q3 of 2013 actually show negative growth quarter-to-quarter while the "Google Websites" revenue streat showed no growth in Q1 but growth in Q2, Q3 and Q4.
However, the report also shows that Adsense revenue lags way behind Google's own website revenue. And that growth looks robust throughout 2013.
This is in stark contrast to a decade ago. In 2003 Google Websites revenues increased 159% (year-over-year) while Network Members' Websites revenues (Adsense) increased a whopping 505% (over previous year).
In 2004 Google websites revenues increased 101% versus 147% for Network Members revenues (Adsense).
However from about 2005 onwards the Google Websites revenues all increased year-over-year by greater amounts than the Network Members' Website revenues (Adsense).
Since 2006 it appears that Adsense has assumed a lesser role in Google's revenue stream. And every year since that role has diminished.
So perhaps Google (as the Silicon Valley Watcher claims) is backing away from Adsense. We might be more trouble than we're worth.