Doesn't an alignment need to be done after bolting the control arm back on??

The control arm doesn't need to be unbolted, just lowered. If you loosen the bushings prior to lowering it, allowing the bushings to move, you will indeed need an alignment afterwards.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280