Soldato
Given there is an overall cost cap now, they could relax the rules on testing which were ultimately there to try and rein in the top teams and their far bigger bucket of cash.
Top teams still have some advantage as not everything is under the budget cap. Look at Merc in 21, using 11 engines between their drivers (most other teams used 8 and some only 6 that season) winning the constructor championship and if it wasn't for Masi's brain fart moment they would have won driver's one as well. At the widely reported cost of £10mil per engine that's £30mil more spent than most other teams that season.