dipper and mabel vs the future

Gravity Falls S2 E17 "Dipper and Mabel vs. the Future". Blendin is even more stammery than usual. Is it because Bill is doing a less than perfect impression, or that the real Blendin is trying to fight him from the inside? Ford. Much of the fanbase seems to have taken Ford's speech to Dipper as disparaging Mabel and/or projecting his own ... dora and friends into the city