why did gandhiji object to cf andrews stay at champaran?

According to Gandhi's lawyer friends, the stay of Andrews at Champaran was thought of to be a good idea as Andrews, being an Englishman would prove to be helpful to them.

However, Gandhi opposed to this idea because -

1. according to him, thinking of having an Englishman on one's side just because it would be helpful only shows the weakness in their heart.

2. one must be self reliant and hence, rely only upon themselves to win a battle.