The Angels have had some strong lefties out of the bullpen in the past. Jose Alvarez was very solid his last two years with the team before being traded for the utterly worthless Luis Garcia last winter.
The best lefty out of the pen in the past 10 years was Scott Downs. Downs was lights out against lefties and not bad against right-handed hitters. With this being said the Angels could use a good lefty out of the pen and there a lot of options out there every year, it is just a fact of do they want to spend the money on anyone with so many other fish to fry.
If they have a proven track record and are not getting too old I’d say go for a good lefty specialist it could be an extra weapon that not all teams have. We will have to see if Billy Eppler can find a good pitcher for this role.