If we are allowed to make the assumption that they wouldn't say 'five of their last six' if they lost the first game (instead saying something like 'winners of 5 straight'

, we should know that the pattern of the last six games must have been WLWWWW.
If we go a step further and wonder why they haven't said 'six of their last seven,' we should realize that the previous game should have been a loss as well.
Of course, these both require assumptions. The only thing we know for sure is that it's either WLWWWW or LWWWWW over the last 6 games. The second seems unlikely, but it's possible.
As far as THIS Jet fan is concerned, any 5-1 streak is a good one.