Grant's recent performance:
2013 Record: 8-4, Tied for 1st Delta Valley, Lost to Yuba City 2nd round D2 playoffs
2014 Record: 14-1, 1st place Delta, Lost to Folsom in Norcals (after winning D2 section title)
2015 Record 10-2, 2nd place Delta, Lost to Granite Bay 2nd round D2 playoffs
2016 Record 8-4, Tied for 4th place Delta, Lost to Antelope 2nd round D2 playoffs.
I'm not sure why people are so excited that Grant is going to dominate the SFL when they have not won the Delta title in 3 years, and have had pretty poor playoff records outside of 2014. And as an objective measure, Grant is 3-5 vs. the SFL teams in that same span (2-5 if NU is excluded as they will not be in the SFL next year).
Grant will be a good addition to the league and will be a competitive team. But to act like the SFL will now be different due to Grant joining seems to be wishful thinking. Oak Ridge and Folsom joining the league was a much bigger change.