BOSTON — Loui Eriksson was the top candidate to replace Jarome Iginla at right wing on the Bruins’ first line to start the season, but that plan was put on hold when veteran center David Krejci was forced to miss 20 of the first 31 games because of an injury. Even though Eriksson has played well in the limited time he’s skated alongside Krejci and Milan Lucic since joining the Bruins before the 2013-14 campaign, the best place for him is with Carl Soderberg and Chris Kelly on the third line. Soderberg and Kelly have been Eriksson’s linemates for most of the season, and it’s obvious that they have developed impressive chemistry, specifically Soderberg and Eriksson. As