Derek Fisher has rejoined the Oklahoma City Thunder, which could be terrific or terrifying depending on your viewpoint. But what's undisputable is how bringing back Fisher makes a lot of sense for the Thunder. Adding the veteran point guard for the remainder of the season has the potential to do much more good than harm. At this point, we're just unsure how Thunder coach Scott Brooks intends to use him. Nevertheless, for those still wondering why Oklahoma City rekindled an old flame, here are five reasons that should help you understand the organization's thinking. Insurance: The No. 1 reason this deal went down. OKC shipped reserve point guard Eric Maynor to Portland at the trade deadline last Thursday and was left with only Russell Westbrook and Reggie Jackson at the point guard spot. Teams generally like to have three point guards for emergency purposes. For a team that expects to make another deep playoff run, entering the postseason with only two lead guards would have been risky. Fisher also brings stability to the position in the event that Jackson, still in just his second season, struggles under the playoff spotlight.