The strategy is to have as many committed anti-EU elements in parliament in the House of Commons as is possible. If you accept this premise, the rest follows logically.
Hence there is no point in removing the handful of already committed anti-EU MPs who are already there; or removing with competition any fully committed anti-EU candidates of any party.
Your comments are directed to the Conservatives: we are interested in Labour candidates too.
I don't expect any Lib Dims to be involved as they are all fully committed to giving Britain away fully and completely over to the EU. In fact they have a bloody cheek standing at all - anywhere - as they are total hypocrites wanting to be in parliament as MPs when they want to give away all the powers of parliament to the EU.