well in the chasing forever one, i dont know about the gucci part but i do know the carrot part. They measure gold in carrots, the smallest is 9, but the more carrots your gold has, the more expensive/better it is etc. Hes basically saying hes gonna give Jada loads of carrots of gold, then he made that analogy to bugs, coz bugs eat carrots. i hope that makes sence, its hard to explain.
The rain one, i think hes trying to say we are supposed to feel the rain/bad things in life. If we feel the rain we can overcome it and become a better person bcoz of it. He thinks children should be allowed to feel a bit of struggle to help them grow as people. I think he feels the rain, but tries to not let it bother him.
and the last one, i think i heard it was jaden that was praying to God, but i think all his children inspired him, bcoz he cant answer why these things are happening to any of them.
hope that helps. I think diffenet people can get different things from Wills songs sometimes, i like to think u can interpret it your own way.