The story of Shaknarsheth Vaghela and SM Krishna tells us something about this topic. SM Krishna joined BJP in karnataka with great views of upcoming elections. Shankarsheth vaghela a former BJPian wants chief ministerial candidature in Gujarat from Congress.
There is another story of a good leader of congress in northeast, Himanta Biswa from Assam.Leaders are threatening to change their sides if their conditions are not met.
The parties like congress have weaknesses like no strategy, rudderless, chaos at ground level. And it makes the leaders demand more and more. It needs to nurture local leaders , make unity, rather than centralising the powers.
Parties should have its strong values. It should not be easy to change parties. Parties should keep its members united and values minded.