We also had some freelancers like that and one employee who lasted 3 months - and always it was company owners who wanted to "bring help to speed things up".
Those guys ignored everything and did code the way they knew how to do it. Results were always bad and 3 months guy instead of speeding anything up trashed all team productivity for those 3 months and I guess even 2 more when we had to do the cleanup of his worst inventions.