AXI WVALID before AWVALID

what happen if WVALID asserted before AWVALID ??
AXI4-lite :Wready dependency on Awvalid and Wvalid

In specification it is mentioned that WREADY signal can wait for AWVALID and WVALID signals. Does it mean that WREADY signal should be asserted only after assertion of AWVALID and WVALID signals. ...
In case of AXI4 lite protocol,what is the relation between BValid signal and Wvalid signal?

In case of AXI4 lite protocol,whether BValid should be asserted before WVALID signal deassertion? what is the legal case?
What purpose do wrapping BURST transfers serve?

I've understood how it works and what happens in it, but what is the use of having a wrapping bursts? What are some scenarios where it provides an edge?
What purpose does BURST feature in AHB serve?

I am not able to see any visible improvements due to the BURST transfers. The same BURST transfer could be done through multiple SINGLE transfers, in the same number of cycles. Then what is te advantage...