What crucial constraint on outer planet formation is implied by the need for Jupiter and Saturn to capture vast envelopes of light gas?

Answer

Core formation must have been extremely efficient, potentially completing within just a few million years

For Jupiter and Saturn to become gas giants, they needed to accrete massive rocky/icy cores rapidly enough to capture gas before the Sun's intense solar wind blew that gas away.

What crucial constraint on outer planet formation is implied by the need for Jupiter and Saturn to capture vast envelopes of light gas?
Originstarplanetsolar systemhypothesis