I'm still not seeing what you're basing your 'crank' assertion on.
As I said before, Dr Sears is an example of a doctor who mentions spacing out Vaccines in relation to Al. I'm not sure what Catherina's specific concerns are with his opinions on Al and you haven't said either.
Wrt to MMR/Al. You initially said:
"If there WERE a risk, it would in any case be best to have the combined shots all-in-one as you're receiving less Al."
I explained that spreading/spacing out was not to do with seperating out individual componants of the combined vaccine but giving them at different times to the pneumococal/Men C vaccines and you replied:
"bm: I was under the impression parents wanted to give separate MMR jabs?"
Which was why I replied that they do but it's not to do with Al (which was what your initial question about separating the vaccines was to do with - see above)
Immune overload was another of the reasons I mentioned in my first post and I explained why some people may be concerned - because it bypasses the skin, mucous membranes etc that have an important role in the body's immune response.
To put your quote in context, the article says:
"Our analysis shows that infants have the theoretical capacity to respond to about 10,000 vaccines at once...Using this estimate, we could predict that even if all 11 of the routinely recommended vaccinations were given to infants at one time, only about .01 percent of the immune system would be used" (Emphasis added)
Without even going into how they've estimated 'how much' of the immune system is used (given how much is still not completely understood about it) - it's not exactly concrete is it? If you've been reassured by it though then that's good but I don't think you are really in a position to dismiss other people's concerns.
p.s there are plenty of studies investigating the safety of tap water.