I'll give you Eisner, but Kroc's first franchise was the 9th McDonald's overall and he is the sole reason for its international dominance, so he's not a founder only in the technical definition of founder. Technically, Warren Buffett is not the founder of Berkshire Hathaway, the old textile business.
As for Welch, GE Capital was a good chunk of GE's revenue and profits... right up to 2008 [1] where it might have sunk the company; it is now being sold off by Immelt [2]. So much for the industrial group giving the financial side "stability"...
[1] http://archive.fortune.com/2008/10/09/news/companies/colvin_...
On its business: " though the average citizen probably thinks of GE as a great industrial company, its industry classification in the Fortune 500 is diversified financials. It is by far the largest company in that industry group. The next biggest - and here we begin to glimpse GE's troubles - are Fannie Mae (FNM, Fortune 500) and Freddie Mac (FRE, Fortune 500).
The reality is that for years, about half of GE's prodigious profits have come from General Electric Capital."
On 2008: "But now the stock trades for less than half its price 12 months ago. More than $200 billion of value has vaporized."
[2] https://en.wikipedia.org/wiki/GE_Capital#Restructuring_plan
[3] On who built GE Capital: http://archive.fortune.com/magazines/fortune/fortune_archive... [1997]
"At another level, a small crowd of professional GE watchers know that CEO Jack Welch owes a surprising amount of his success to a profit dynamo called GE Capital Services. What only a handful of people understand--given GE Capital's reclusive nature--is how important this secret weapon has become to GE's continued prosperity, and what a model it is for managers trying to grow in any business."