what lokpal is without cbi?

According to recent steps by government it seems that Lokpal will behave just like a complaint filing institute. 

•  Lokpal will conduct preliminary(or initial)  investigation into a corruption complaint and refer it to CBI for investigation.
• CBI would investigate the same and then forward the case to the directorate of public prosecution to be created under the supervision of Lokpal. 
• Any suggestion by the Lokpal for prosecution should be accepted. A rejection, if any, should come either from the secretary of the department(lokpal) concerned or a higher authority.
• The committee outlined a structure that harmonises or coordinates the roles of the Central Bureau of Investigation, Central Vigilance Commission and Lokpal.
  

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Problem is not that lokpal will undertake  initial  investigation but is that further investigation will be done by a institute which is promptly misused by any party in majority. If government does not want cbi under lokpal then its OK, but its is never good having government's control over cbi. So government should as a alternate solution to the situation at least take some steps to eradicate its own  control over cbi. Because if Cbi will be free from any political control then we also don't need it under lokpal.
However if opposite happens and government doesn't its own  control over cbi.  (which is actually happening) then all that will happen is that we will have same cbi(under political control) and a Lokpal without enough power for investigation, so I ask governmet how will the investigation be transparent and non-prejudiced ?and in that way how is this lokpal powerful.

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