If Modi has really bypassed established channels of corruption within the party, then that is a really good thing.
If Modi has thus delivered even a minor blow to corruption (which is plausible considering that he faces intense ill will within his party), then Modi really ought to win all elections henceforth.
The Congress (which is no different from the BJP in terms of corruption) too ought to get itself some new leaders who can challenge the established rot that pervades the party.