Did walcott leave Southampton to early?

I think Theo did leave to early i knew he wouldn't stay forever but i hope that oxlade-chamberlain really thinks about it before just leaving because as you said maturing as a footballer is very important and I think Oxlade-Chamberlain is too early into his career to make it too bigger leagues but to be honest Jack Wilshere and Ramsey and Kakuta and a lot of others have done well but i still think Oxlade-Chamberlin should stay at Southampton or atleast another year