Brother, there is no Deobandi and Salafi comparison. There is either following a Madh'ab or being a Salafi. Deobandi is a term that gained fame because of the excellence of the scholars from Deoband Madrassa, and also due to the false allegations from a very confusedly deviant sect in the sub-continent. Deobandi is often used (in the sub-continent) to clarify that I follow in accordance to the Ulema of Deoband and am not amongst the innovated sects. A Deobandi Hanafi (who have studied from Deoband or its sister institutions, or follow the rulings from the scholars affiliated with Deoband Madrassa) and a Hanafi anywhere around the world has no difference. Also, being a Hanafi does not require you to be Bay'ah to a Shaykh. Bay'ah is preferable, however the aim is to purify yourself and that is obligatory on every believer. On being a Salafi, I do not reply because I may be biased due to the people I have encountered have given me this weird impression. I guess Brother Abu Fatimah can help you understand their ideology better. In regards to your question of proving Silsilah, Bay'ah, I guess some knowledgeable brother will clarify the issue to you. And Allah knows best.