sj0000
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0) It's validation.
1) Execution will be different, they might bork it or serve different customer segments.
Cons
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0) Find/create durable competitive advantage/s
1) Win-Lose/Lose-Lose competition sucks because it's often dumb (see also: Peter Thiel)
What set SJ apart was positive value (being right more often than not, building people up to produce better work products than they thought the could, a determined direction, actual vision) on balance outweighing negative traits (histrionic tantrums, treating employees like shit, generally acting like an asshole).
A cautionary note: If someone is going to play the eccentric jerk role, they'd better be actually right nearly always and bring metric fucktons of net positive value by the containership-full to the business, staff, customers, partners and other stakeholders.