Hi there, Adsense, Webmaster, Google+, if everything is used from a same GMAIL account for a blog, is there any benefit? I mean, is it confusing to Google, if we use Adwords from one account, webmaster tools from one account, adsense from one account, G+ from another? Will it hurt SEO, anyway? Hope the question is not so stupid one, Shafin.
It is not confusing, but that this the purpose of Google products, to not make it confusing for you. I mean why would you make 5 account and use 5 different products instead of using 1 account with different products.
Be sure to read the terms of service and abide by them. There are all sorts of rules and fine print. Sometimes it is valid to "try" to get multiple accounts such as Adsense bans or Adword coupon usage. There are also/can be penalties for violations. Rather than using GMail it is better to have a keyword rich domain name that you use such as webmaster@lose50in30daysweightloss(.)com (just made that up) That way every place you use your email address promotes your website