most diabetologists will tell you there is a definite link between type 2 diabetes and obesity. The link isn't if you are diabetic you are fat, it's if you are fat you have a higher risk of developing type 2 diabetes.
Agree. One suggestion for the link between obesity and diabetes is that people with large amounts of body fat have a high level of a particular type of fats called NEFAs (non esterified fatty acids) in their blood, and high blood levels of NEFAs are in turn associated with decreased sensitivity to insulin which is the underlying process in Type 2 diabetes. This was the hot new theory when I was involved in research into the causes of Type 2 in the 1990s but since then there have been papers both for and against.
One of the problems with all the "x causes diabetes" theories is that Type 2 Diabetes as currently classified is almost certainly not a single disease with a single cause but rather a classification that seems to cover a similar outcome resulting from a multitude of contributing causes in different people. You see thin ones and fat ones, ones where the whole family has it and ones where they don't know anybody who has it, people who get complications despite their best efforts and people who seem to sail through life without problems.
Biggest improvement in care I have seen in the last 10 years has been from improvements in patient education through courses like DAFNE, DESMOND and Xpert. Pumps suit some people and not others and are fine if they are viewed as a tool for delivering insulin and not as items with intrinsic religious worth as seemed to happen at one stage in their infancy.