In your case it could be coincidence but I doubt it. More likely the junior VC (or the partner he spoke with) reached out to a friend or someone they know at the other firm(s) and said hey this looks interesting but we haver to pass for X reason. A VC's goal is to make money, even if you are a competitor to one of their holdings you being in market with a great product helps their holding too. People think the lack of competition is great, it isn't, having competition in market is much better. It lowers cost of client acquisition for everyone and increases awareness so it isn't all on one company (or VC) to fund. VC's know this.