Gojo never said Sukuna can easily break from the inside, he said he isn't attempting to break from the inside but rather doing it from the outside.
Secondly, Mahoraga was adapting all along to Infinity - not to Void. Sukuna landed inside Void because he was sloppy and slower than Gojo.
gojo said his inside is now weaker than before
they had an equal clash( inside ) in their 1st domain battle
but now gojo's inside is weaker
tf do u think would have happened if sukuna went for the inside clash
gojo also said that going for the inside is an easier option
breaking his domain from the outside is a riskier option
its either sukuna is a retarded character who is just going for the riskier option or he has a plan for this entire thing
i am pretty sure u know what the correct thing is
gojo has been playing into sukuna's hands these last 2 chapters , he was asking himself why sukuna isnt using maho but sukuna has always had the wheel out to adapt to gojo