Tommy Kahnle came to the Boston Red Sox late in the offseason, and it was clear that the 11-year veteran reliever would need to build up in Triple-A. Now that the first month of the season is coming to a close, however, the Red Sox may be forced into a decision on whether to bring him up to the big leagues. Fortunately, they would only have to do so if one of their rival clubs is willing to move mountains for him. Kahnle has a May 1 upward mobility clause, meaning another club could sign him to its active roster if the Red Sox won't call him up to theirs. Boston would have a chance to match, but it only becomes an issue if one of those other 29 teams forces the action. If you like our content,  choose Sports Illustrated as a preferred source on Google . Will Kahnle be in Boston soon?…